---
product_id: 88990456
title: "Knobonly 10 Pairs (20 Pcs) 21 Inch Undermount Drawer Slides, Soft Close Full Extension, 85lb Load Capacity, Complete with All Hardware for Whole Kitchen Cabinet Set"
brand: "knobonly"
price: "3072.63 DT"
currency: TND
in_stock: true
reviews_count: 11
category: "Knobonly"
url: https://www.desertcart.tn/products/88990456-knobonly-10-pairs-20-pcs-21-inch-undermount-drawer-slides
store_origin: TN
region: Tunisia
---

# 21-inch full extension soft-close silent glide 85lb load capacity Knobonly 10 Pairs (20 Pcs) 21 Inch Undermount Drawer Slides, Soft Close Full Extension, 85lb Load Capacity, Complete with All Hardware for Whole Kitchen Cabinet Set

**Brand:** knobonly
**Price:** 3072.63 DT
**Availability:** ✅ In Stock

## Summary

> 🔧 Upgrade your cabinetry game with smooth, silent, and sturdy slides that professionals trust!

## Quick Answers

- **What is this?** Knobonly 10 Pairs (20 Pcs) 21 Inch Undermount Drawer Slides, Soft Close Full Extension, 85lb Load Capacity, Complete with All Hardware for Whole Kitchen Cabinet Set by knobonly
- **How much does it cost?** 3072.63 DT with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/88990456-knobonly-10-pairs-20-pcs-21-inch-undermount-drawer-slides)

## Best For

- knobonly enthusiasts

## Why This Product

- Trusted knobonly brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Heavy-Duty Strength:** Supports up to 85 lbs for robust drawer loads without compromise.
- • **Full-Access Extension:** 21-inch slides provide complete drawer access for maximum convenience and organization.
- • **Sleek Undermount Design:** Concealed mounting saves space and delivers a modern, clean aesthetic to any kitchen or office.
- • **Whisper-Quiet Soft Close:** Experience smooth, silent drawer closing that prevents slams and protects cabinetry.
- • **Complete Installation Kit:** Includes all mounting hardware and adjustable locking devices for a seamless, professional fit.

## Overview

Knobonly’s 10-pair set of 21-inch undermount drawer slides combines heavy-duty alloy steel construction with a soft-close mechanism and full-extension design. Engineered to support up to 85 lbs, these slides come complete with all necessary hardware for easy installation across kitchen, bathroom, or office cabinetry. Their concealed undermount style maximizes space and delivers a sleek, wobble-free drawer operation, making them the go-to choice for millennial professionals seeking durable, quiet, and stylish drawer solutions.

## Description

Knobonly 10 Pairs (20 Pcs) 21 Inch Undermount Drawer Slides, Soft Close Full Extension, 85lb Load Capacity, Complete with All Hardware for Whole Kitchen Cabinet Set - desertcart.com

Review: Get help if you haven’t used this style before. - Work well if know how to install. Tolerances on mounting glides are minimal and critical. 3/4” draw sides fit tight and make proper operation of draw tough. I’ve purchased 10-15 pairs and had only 1 or 2 that had broken or bad sliding action.
Review: Excellent product at an affordable price - ⭐️⭐️⭐️⭐️⭐️ Smooth, Sturdy, and Great Value! I purchased the 10 Pair 21" Undermount Drawer Slides Soft Close Full Extension Drawer Rails for a custom cabinetry project, and I couldn’t be happier with the results. Installation: The slides came well-packaged with all the necessary mounting screws and adjustable locking devices. The instructions were decent, but if you're new to drawer installations, you might want to watch a couple of videos for a smoother process. The adjustment features on these slides made fine-tuning the drawer alignment quick and easy. Performance: The soft-close mechanism works flawlessly—smooth, quiet, and with just the right resistance. They offer full extension, which is a game-changer when you need full access to your drawer contents. Once installed properly, they glide like butter and feel very sturdy under load. Value: For the price and the fact that you’re getting 10 pairs, this is an excellent deal compared to big box store pricing. I would absolutely recommend these for anyone doing a kitchen, bathroom, or furniture build. Pro Tip: Double-check your cabinet and drawer measurements before ordering, and make sure you have the right undermount drawer design to work with these slides. Overall, a solid product that performs just as well as name-brand options at a fraction of the cost. Will definitely buy again!

## Features

- Heavy-Duty Construction & Smooth Soft-Close: Made from high-grade cold-rolled steel with zinc plating for lasting durability. These full-extension slides support loads up to 85 lbs and feature a reliable soft-close mechanism that gently and quietly closes drawers every time, preventing slam and enhancing safety
- Precise Fit & Complete Installation Kit: This set includes 10 pairs of slides (20 pieces total), along with a full set of matching installation hardware: all necessary mounting screws, 10 pairs of adjustable locking devices, 10 pairs of rear mounting brackets, and installation instructions. Designed for a 21" drawer length and fits cabinet depths of 22.3"-23.1" (566-586mm), providing a bulk solution for entire kitchen or whole-house furniture fabrication projects
- Full Extension & Stable, Wobble-Free Operation: Achieve full access with a smooth 455mm (18”) pull-out length. The reinforced design and robust construction ensure stable, side-to-side wobble-free movement even when fully extended, protecting your drawer fronts from scraping against adjacent surfaces
- Universal Undermount Application & Space-Saving Design: The concealed bottom-mount design saves interior space and offers a clean, modern look. Versatile for use in kitchen, bathroom, office, or storage furniture. Important Note: Ensure proper side clearance (typically 1/2” to 1”) between the drawer box and cabinet interior for optimal function
- Reliable Support & Satisfaction Guarantee: We stand by our product quality. If you encounter any issues with product performance or installation, please contact our responsive customer service within 24 hours for assistance, replacement, or refund

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07G8598T1 |
| Best Sellers Rank | #71,451 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #161 in Cabinet & Furniture Drawer Slides |
| Brand Name | Knobonly |
| Color | Silver |
| Customer Reviews | 4.2 4.2 out of 5 stars (777) |
| Drawer Type | Storage |
| Finish Types | Steel |
| Included Components | Case |
| Item Type Name | cabinet-and-furniture-drawer-slides |
| Manufacturer | Knobonly |
| Manufacturer Part Number | 533H-LF-DSHH-10Pair |
| Material Type | Alloy Steel |
| Maximum Weight Capacity | 85 Pounds |
| Mounting Type | Under Mount |
| Number of Items | 10 |
| UPC | 717332818103 |
| Unit Count | 20.0 Count |

## Product Details

- **Brand:** Knobonly
- **Color:** Silver
- **Finish Type:** Steel
- **Material:** Alloy Steel
- **Mounting Type:** Under Mount

## Images

![Knobonly 10 Pairs (20 Pcs) 21 Inch Undermount Drawer Slides, Soft Close Full Extension, 85lb Load Capacity, Complete with All Hardware for Whole Kitchen Cabinet Set - Image 1](https://m.media-amazon.com/images/I/71OvWanRYRL.jpg)
![Knobonly 10 Pairs (20 Pcs) 21 Inch Undermount Drawer Slides, Soft Close Full Extension, 85lb Load Capacity, Complete with All Hardware for Whole Kitchen Cabinet Set - Image 2](https://m.media-amazon.com/images/I/71N8fN9+vDL.jpg)
![Knobonly 10 Pairs (20 Pcs) 21 Inch Undermount Drawer Slides, Soft Close Full Extension, 85lb Load Capacity, Complete with All Hardware for Whole Kitchen Cabinet Set - Image 3](https://m.media-amazon.com/images/I/81dcV3VQTWL.jpg)
![Knobonly 10 Pairs (20 Pcs) 21 Inch Undermount Drawer Slides, Soft Close Full Extension, 85lb Load Capacity, Complete with All Hardware for Whole Kitchen Cabinet Set - Image 4](https://m.media-amazon.com/images/I/81fm-9ChABL.jpg)
![Knobonly 10 Pairs (20 Pcs) 21 Inch Undermount Drawer Slides, Soft Close Full Extension, 85lb Load Capacity, Complete with All Hardware for Whole Kitchen Cabinet Set - Image 5](https://m.media-amazon.com/images/I/71kEojH-xbL.jpg)

## Available Options

This product comes in different **Size, Style** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Get help if you haven’t used this style before.
*by O***0 on December 30, 2025*

Work well if know how to install. Tolerances on mounting glides are minimal and critical. 3/4” draw sides fit tight and make proper operation of draw tough. I’ve purchased 10-15 pairs and had only 1 or 2 that had broken or bad sliding action.

### ⭐⭐⭐⭐⭐ Excellent product at an affordable price
*by K***Y on June 16, 2025*

⭐️⭐️⭐️⭐️⭐️ Smooth, Sturdy, and Great Value! I purchased the 10 Pair 21" Undermount Drawer Slides Soft Close Full Extension Drawer Rails for a custom cabinetry project, and I couldn’t be happier with the results. Installation: The slides came well-packaged with all the necessary mounting screws and adjustable locking devices. The instructions were decent, but if you're new to drawer installations, you might want to watch a couple of videos for a smoother process. The adjustment features on these slides made fine-tuning the drawer alignment quick and easy. Performance: The soft-close mechanism works flawlessly—smooth, quiet, and with just the right resistance. They offer full extension, which is a game-changer when you need full access to your drawer contents. Once installed properly, they glide like butter and feel very sturdy under load. Value: For the price and the fact that you’re getting 10 pairs, this is an excellent deal compared to big box store pricing. I would absolutely recommend these for anyone doing a kitchen, bathroom, or furniture build. Pro Tip: Double-check your cabinet and drawer measurements before ordering, and make sure you have the right undermount drawer design to work with these slides. Overall, a solid product that performs just as well as name-brand options at a fraction of the cost. Will definitely buy again!

### ⭐⭐⭐⭐ Great product, but horrible shipping and instructions
*by M***U on November 21, 2022*

Customer wanted new drawer boxes with undermount slides and didn't want to spend the money on Blum's, so thought I'd give these a try. First, they arrived pretty beat up and one set of the slides has a bent upright which I'll have to try to bend back to use, but luckily I only needed the other 4 (bought a 5-pack) for the job. The instructions are horrible and in metric. Luckily I found a good YouTube from Bourbon Moth Woodworking that went over the installation. Once you know the tricks, they are very easy to install. In the end they worked great and close very nice.

## Frequently Bought Together

- 10 Pair 21" Undermount Drawer Slides Soft Close Full Extension Drawer Rails, Mounting Screws and Adjustable Locking Device Included
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- Knobonly 10 Pair 18" Undermount Drawer Slides Soft Close Full Extension Drawer Rails, Mounting Screws and Adjustable Locking Device Included, 85 lb Load Capacity, Zinc Plated Cold Rolled Steel

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*Product available on Desertcart Tunisia*
*Store origin: TN*
*Last updated: 2026-07-25*