--- product_id: 603410932 title: "400/600 Grit 4lb Aluminum Oxide Rock Tumbler Pre Polish, Stage 3 Rock Polishing Grit for Stone Polishing, Compatible with Rotary & Vibratory Tumblers, Premium Lapidary Grit" brand: "mjr tumblers" price: "312.79 DT" currency: TND in_stock: true category: "Mjr Tumblers" url: https://www.desertcart.tn/products/603410932-400-600-grit-4lb-aluminum-oxide-rock-tumbler-pre-polish store_origin: TN region: Tunisia --- # Stage 3 perfect polish 400/600 grit precision Proudly USA made 400/600 Grit 4lb Aluminum Oxide Rock Tumbler Pre Polish, Stage 3 Rock Polishing Grit for Stone Polishing, Compatible with Rotary & Vibratory Tumblers, Premium Lapidary Grit **Brand:** mjr tumblers **Price:** 312.79 DT **Availability:** ✅ In Stock ## Summary > 🪨 Elevate your stones to museum-quality shine with every tumble! ## Quick Answers - **What is this?** 400/600 Grit 4lb Aluminum Oxide Rock Tumbler Pre Polish, Stage 3 Rock Polishing Grit for Stone Polishing, Compatible with Rotary & Vibratory Tumblers, Premium Lapidary Grit by mjr tumblers - **How much does it cost?** 312.79 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/603410932-400-600-grit-4lb-aluminum-oxide-rock-tumbler-pre-polish) ## Best For - mjr tumblers enthusiasts ## Why This Product - Trusted mjr tumblers brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Bulk 4lb Supply:** Ample quantity for multiple polishing projects without interruption - • **Trusted by Experts:** Preferred over mainstream kits for superior polish results - • **Veteran-Owned Quality:** Support a disabled and veteran-owned American company - • **Precision 400/600 Grit:** Engineered for flawless third-stage stone shaping - • **Universal Compatibility:** Works seamlessly with any rock tumbler brand ## Overview MJR Tumblers Premium 400/600 Aluminum Oxide Grit offers a super fine polishing stage for rock tumblers, delivering professional-grade shaping and pre-polish results. Proudly made in the USA by a disabled and veteran-owned company, this 4lb pack ensures compatibility with all tumbler brands and is highly rated for outperforming standard polishing kits. ## Description MJR Tumblers 400/600 Grit 4lb Aluminum Oxide Rock Tumbler Pre Polish, Stage 3 Rock Polishing Grit for Stone Polishing, Compatible with Rotary & Vibratory Tumblers, Premium Lapidary Grit: desertcart.com: Industrial & Scientific ## Features - STAGE 3 PRE-POLISH FOR SMOOTH TRANSITION: This 400/600 grit aluminum oxide is designed for the third stage of rock tumbling, refining stone surfaces after initial shaping and smoothing. Helps prepare rocks for final polishing by reducing visible scratches and improving surface consistency. - PREMIUM ALUMINUM OXIDE FOR CONSISTENT RESULTS: Made from high-quality aluminum oxide, this grit provides reliable performance during the pre-polish stage. Designed to deliver even abrasion across stones, helping achieve a smooth and uniform finish before final polishing. - COMPATIBLE WITH ROTARY & VIBRATORY TUMBLERS: Suitable for use with most rock tumblers, including rotary and vibratory machines. A versatile option for maintaining your rock polishing process or replacing stage 3 grit in your workflow. - IDEAL FOR ROCKS, GLASS & LAPIDARY USE: Can be used for polishing stones, minerals, and even glass materials. Provides flexibility for a range of polishing applications, making it a useful addition to any rock tumbling setup. - USA OWNED BRAND WITH TRUSTED QUALITY: Offered by a USA-based, disabled and veteran-owned company. MJR Tumblers provides dependable rock tumbling supplies designed for consistent performance and ease of use. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0CP8VW2T4 | | Best Sellers Rank | #27,970 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #45 in Tumbling Media | | Brand | MJR Tumblers | | Brand Name | MJR Tumblers | | Compatible Material | Black Silicon Carbide | | Customer Reviews | 4.4 out of 5 stars 21 Reviews | | Grit Material | Aluminum Oxide | | Grit Material Type | Aluminum Oxide | | Grit Number | 600 | | Grit Type | Super Fine | | Included Components | Instructions and Grit | | Item Weight | 4 pounds | | Manufacturer | MJR Tumblers | | Material | Aluminum Oxide, Silicon Carbide | | Material Type | Aluminum Oxide, Silicon Carbide | | Number of Items | 1 | | Number of Packs | 1 | | Part Number | MJR4p400/600AO | | Set Name | Stage 3 | | Unit Count | 1 Count | ## Product Details - **Brand:** MJR Tumblers - **Grit Material:** Aluminum Oxide - **Grit Type:** Super Fine - **Item Weight:** 4 pounds - **Material:** Aluminum Oxide, Silicon Carbide ## Images ![400/600 Grit 4lb Aluminum Oxide Rock Tumbler Pre Polish, Stage 3 Rock Polishing Grit for Stone Polishing, Compatible with Rotary & Vibratory Tumblers, Premium Lapidary Grit - Image 1](https://m.media-amazon.com/images/I/51FmTcNLZ0L.jpg) ![400/600 Grit 4lb Aluminum Oxide Rock Tumbler Pre Polish, Stage 3 Rock Polishing Grit for Stone Polishing, Compatible with Rotary & Vibratory Tumblers, Premium Lapidary Grit - Image 2](https://m.media-amazon.com/images/I/71VEE0eqiZL.jpg) ![400/600 Grit 4lb Aluminum Oxide Rock Tumbler Pre Polish, Stage 3 Rock Polishing Grit for Stone Polishing, Compatible with Rotary & Vibratory Tumblers, Premium Lapidary Grit - Image 3](https://m.media-amazon.com/images/I/71d6xQMgukL.jpg) ![400/600 Grit 4lb Aluminum Oxide Rock Tumbler Pre Polish, Stage 3 Rock Polishing Grit for Stone Polishing, Compatible with Rotary & Vibratory Tumblers, Premium Lapidary Grit - Image 4](https://m.media-amazon.com/images/I/61UV0iJ0o5L.jpg) ![400/600 Grit 4lb Aluminum Oxide Rock Tumbler Pre Polish, Stage 3 Rock Polishing Grit for Stone Polishing, Compatible with Rotary & Vibratory Tumblers, Premium Lapidary Grit - Image 5](https://m.media-amazon.com/images/I/71cJ5kYQK2L.jpg) ## Available Options This product comes in different **Size, Style** options. ## Frequently Bought Together - 4lb of MJR Tumblers Premium 400/600 Pre-Polish Aluminum Oxide Rock Polishing Grit for Step/Stage 3, MJR Tumblers is a Disabled and Veteran Owned Company Proudly Located in USA - 4lb of MJR Tumblers Premium 120/220 Fine Silicon Carbide Rock Polishing Grit for Step/Stage 2, MJR Tumblers is a Disabled and Veteran Owned Company Proudly Located in USA - 10 lbs Rock Tumbler Grit - Tumbler Media Grit,Rock Polishing Grit Media, Works with Any Rock Tumbler, Rock Polisher, Stone Polisher,COARSE 60/90 Silicon Carbide Grit, Step 1 for Tumbling Stones --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.tn/products/603410932-400-600-grit-4lb-aluminum-oxide-rock-tumbler-pre-polish](https://www.desertcart.tn/products/603410932-400-600-grit-4lb-aluminum-oxide-rock-tumbler-pre-polish) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-10-08*