---
product_id: 15150393
title: "Smooth Darby 42 in. Magnesium with Knob and Rail for Even Undercoats and Lightweight Flex Control"
brand: "bon"
price: "628.81 DT"
currency: TND
in_stock: true
reviews_count: 9
category: "Bon"
url: https://www.desertcart.tn/products/15150393-smooth-darby-42-in-magnesium-with-knob-and-rail-even
store_origin: TN
region: Tunisia
---

# 42 in. wide coverage 2.4 lbs lightweight magnesium Knob & rail handle for control Smooth Darby 42 in. Magnesium with Knob and Rail for Even Undercoats and Lightweight Flex Control

**Brand:** bon
**Price:** 628.81 DT
**Availability:** ✅ In Stock

## Summary

> 🛠️ Elevate your craft with the smoothest glide in the game!

## Quick Answers

- **What is this?** Smooth Darby 42 in. Magnesium with Knob and Rail for Even Undercoats and Lightweight Flex Control by bon
- **How much does it cost?** 628.81 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/15150393-smooth-darby-42-in-magnesium-with-knob-and-rail-even)

## Best For

- bon enthusiasts

## Why This Product

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

## Key Features

- • **Perfect Flex Blade:** Adapts seamlessly to contours for flawless, ridge-free undercoats
- • **Wide 42-inch Reach:** Cover large surfaces faster with expansive smooth edge design
- • **Pro-Grade Reliability:** Trusted by plastering and masonry pros for consistent, high-quality finishes
- • **Ergonomic Knob & Rail Grip:** Experience superior control and precision on every stroke
- • **Featherlight Magnesium Build:** Work longer with less fatigue thanks to ultra-light yet durable material

## Overview

The Bon Smooth Darby 42 in. is a professional-grade magnesium masonry tool designed for smooth, even application of undercoats. Its wide 42-inch blade ensures efficient coverage, while the lightweight magnesium construction minimizes fatigue. Featuring an integrated knob and rail handle, it offers superior grip and control, and its flexible blade adapts to surface contours for flawless finishes. Ideal for plastering, stucco, and masonry pros seeking precision and durability.

## Description

The Bon Smooth Darby with Knob and Rail is a 42 in. magnesium tool designed for professionals seeking perfect undercoat application with smooth, even finishes. Unlike serrated models, this Darby features a smooth edge for uniform spreading of plaster, stucco, or concrete without leaving marks or ridges. Made from lightweight magnesium, it offers exceptional balance between strength and maneuverability, helping reduce fatigue on long jobs. The built-in knob and rail provide added control and comfort, ensuring precise movement across walls or flatwork. Ideal for finishers who demand quality results, this tool is engineered for flexibility, durability, and efficient coverage. Its ergonomic design and reliable construction make it a go-to choice for applying smooth undercoat layers on any plastering or masonry project.

Review: Very happy to have this - Exactly what I was looking for, it looks like a good solid tool . I'm retired here in the Philippines and building a house there is no place to buy any tools I'm used to using so I'm very happy to have it and I doubt there is another one in the whole country but the guys that watched me use it were impressed. Thanks I'm a happy customer
Review: Worked for me - Used once sell for cheap

## Features

- Smooth edge design ensures clean, uniform application of undercoats without surface scoring or ridging
- 42 in. length provides wide coverage for faster, more efficient work on large wall or flat areas
- Lightweight magnesium construction reduces fatigue while maintaining strength and durability
- Integrated knob and rail handle offers superior control and grip for smoother motion and accuracy
- Perfect flex is built into the blade to adapt to surface contours for even material spread
- Trusted by professionals in plastering, stucco, and masonry for consistent and reliable performance

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00A46NFIO |
| Additional Features | Easy to Install |
| Best Sellers Rank | #559,874 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #1,096 in Masonry Hand Trowels |
| Brand Name | Bon |
| Color | Multicolor |
| Customer Reviews | 4.3 4.3 out of 5 stars (54) |
| Exterior Finish | Steel Alloy Finish |
| Finish Types | Brushed |
| Global Trade Identification Number | 00743153831502 |
| Hand Orientation | Ambidextrous |
| Handle Attachment Mechanism | Knob and Rail |
| Handle Material | Alloy Steel |
| Handle Type | Knob |
| Included Components | DARBY - 42" PLAIN-MAGNESIUM |
| Indoor Outdoor Usage | Outdoor |
| Item Depth | 42 inches |
| Item Dimensions L x W | 42"L x 3.75"W |
| Item Type Name | DARBY - 42" PLAIN-MAGNESIUM |
| Item Weight | 2.4 Pounds |
| Lock Type | Key Lock |
| Manufacturer | Bon Tool |
| Material Type | Blend, magnesium |
| Model Number | 83-150 |
| Number of Items | 1 |
| Shape | Round |
| Style Name | Classic |
| UPC | 743153831502 |
| Unit Count | 1.0 Count |

## Product Details

- **Brand:** Bon
- **Color:** Multicolor
- **Material:** Blend, magnesium
- **Product Dimensions:** 42"L x 3.75"W
- **Style:** Classic

## Images

![Smooth Darby 42 in. Magnesium with Knob and Rail for Even Undercoats and Lightweight Flex Control - Image 1](https://m.media-amazon.com/images/I/51c9G+mlpdL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Very happy to have this
*by S***S on August 14, 2025*

Exactly what I was looking for, it looks like a good solid tool . I'm retired here in the Philippines and building a house there is no place to buy any tools I'm used to using so I'm very happy to have it and I doubt there is another one in the whole country but the guys that watched me use it were impressed. Thanks I'm a happy customer

### ⭐⭐⭐⭐⭐ Worked for me
*by G***Y on April 3, 2025*

Used once sell for cheap

### ⭐⭐⭐⭐⭐ Five Stars
*by G***E on June 21, 2016*

works great

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**Shop now:** [https://www.desertcart.tn/products/15150393-smooth-darby-42-in-magnesium-with-knob-and-rail-even](https://www.desertcart.tn/products/15150393-smooth-darby-42-in-magnesium-with-knob-and-rail-even)

---

*Product available on Desertcart Tunisia*
*Store origin: TN*
*Last updated: 2026-05-31*