---
product_id: 99197438
title: "Rock Tumbler Grit Kit Refill for 18lb Tumblers, 4 Step Silicon Carbide & 12,000 Grit Aluminum Oxide Polish, Stone Polishing Kit for Rotary & Vibratory Rock Tumblers"
brand: "mjr tumblers"
price: "¥20468"
currency: JPY
in_stock: true
reviews_count: 13
category: "Mjr Tumblers"
url: https://www.desertcart.jp/products/99197438-rock-tumbler-grit-kit-refill-for-18lb-tumblers-4-step
store_origin: JP
region: Japan
---

# ultra-fine 12,000 grit polish pre-measured for 18lb tumblers 4-stage precision grit system Rock Tumbler Grit Kit Refill for 18lb Tumblers, 4 Step Silicon Carbide & 12,000 Grit Aluminum Oxide Polish, Stone Polishing Kit for Rotary & Vibratory Rock Tumblers

**Brand:** mjr tumblers
**Price:** ¥20468
**Availability:** ✅ In Stock

## Summary

> ✨ Elevate Your Rock Game: Polish Like a Pro, Shine Like a Star! ⚙️

## Quick Answers

- **What is this?** Rock Tumbler Grit Kit Refill for 18lb Tumblers, 4 Step Silicon Carbide & 12,000 Grit Aluminum Oxide Polish, Stone Polishing Kit for Rotary & Vibratory Rock Tumblers by mjr tumblers
- **How much does it cost?** ¥20468 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/99197438-rock-tumbler-grit-kit-refill-for-18lb-tumblers-4-step)

## 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

- • **Universal Compatibility:** Seamlessly works with both rotary and vibratory tumblers for versatile polishing.
- • **Flawless 4-Stage Polishing:** From rough to radiant with coarse to ultra-fine grit precision.
- • **Bring Out the Shine Like a Pro:** 12,000 grit aluminum oxide polish delivers a showroom-worthy finish.
- • **Veteran-Owned Quality Assurance:** Crafted by a USA-based veteran-owned brand committed to excellence.
- • **Effortless Use with Pre-Measured Packs:** No guesswork—just add and tumble for perfect results every time.

## Overview

The MJR Tumblers Rock Tumbler Grit Kit Refill is a complete 4-step polishing system designed for 18lb rock tumblers. Featuring silicon carbide grits for coarse to pre-polish stages and a premium 12,000 grit aluminum oxide polish for a brilliant final shine, this kit is compatible with both rotary and vibratory tumblers. Pre-measured for convenience and crafted by a USA-based veteran-owned company, it ensures consistent, professional-grade results with every use.

## Description

Buy MJR Tumblers Rock Tumbler Grit Kit Refill for 18lb Tumblers, 4 Step Silicon Carbide & 12,000 Grit Aluminum Oxide Polish, Stone Polishing Kit for Rotary & Vibratory Rock Tumblers: Rock Tumblers - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: Good value for the quality - Top Notch. Switched from another brand and really love how it's making the rocks shine!!!
Review: Great product deceptive practices - Absolutely wonderful product but where there is a positive there's also a negative. The way the bags are presentoo.Seem like you are getting a lot of product. Once hung in that bag , it comes to less than a half an inch of product on the bottom. Quit the deception quit wasting plastic and if you're gonna cell that smell of quantity. Please do not deceive the customers with the large bag.Cut it down your size

## Features

- COMPLETE 4-STAGE ROCK POLISHING SYSTEM: This refill grit kit includes all four essential stages of rock tumbling—coarse (60/90), fine (120/220), pre-polish (400/600), and ultra-fine 12,000 grit aluminum oxide polish. Designed to guide stones from rough surfaces to a smooth, polished finish.
- 12,000 GRIT ULTRA-FINE POLISH FOR FINAL FINISH: The included sub-micron aluminum oxide polish is designed for the final stage, helping bring out a smooth, refined surface. Ideal for achieving a clean and polished appearance after shaping and smoothing stages
- PRE-MEASURED FOR 18LB TUMBLERS – EASY TO USE: Each stage is pre-measured specifically for 18lb rock tumblers, simplifying the polishing process. Just add the contents at each stage and let the tumbler do the work—no complicated measuring required
- COMPATIBLE WITH ROTARY & VIBRATORY TUMBLERS: Works with most rock tumblers, including rotary and vibratory models. A versatile grit refill option for maintaining your polishing workflow or restocking supplies.
- USA OWNED BRAND WITH QUALITY MATERIALS: Offered by a USA-based, disabled and veteran-owned company. MJR Tumblers provides reliable rock tumbling supplies designed for consistent performance and ease of use.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07F75K1WR |
| Best Sellers Rank | #56,935 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #48 in Tumbling Media |
| Brand | MJR Tumblers |
| Brand Name | MJR Tumblers |
| Compatible Material | Aluminum Oxide, Silicon Carbide |
| Customer Reviews | 4.5 out of 5 stars 1,308 Reviews |
| Grit Material | Aluminum Oxide; Silicon Carbide |
| Grit Material Type | Aluminum Oxide; Silicon Carbide |
| Grit Number | 60 |
| Grit Type | Coarse; Fine; Pre Polish; Polish |
| Item Dimensions | 8 x 6 x 1.5 inches |
| Item dimensions L x W x H | 8 x 6 x 1.5 inches |
| Manufacturer | MJR Tumblers |
| Material | Aluminum Oxide, Plastic Pellets, Silicon Carbide |
| Material Type | Aluminum Oxide, Plastic Pellets, Silicon Carbide |
| Model | MJR18pgk |
| Number of Items | 4 |
| Number of Packs | 1 |
| Part Number | MJR18pgk |
| Set Name | Refill Grit Kit |
| Unit Count | 1 Count |

## Product Details

- **Material:** Aluminum Oxide, Plastic Pellets, Silicon Carbide
- **Grit Material:** Aluminum Oxide; Silicon Carbide
- **Item dimensions L x W x H:** 8 x 6 x 1.5 inches
- **Brand:** MJR Tumblers
- **Grit Type:** Coarse; Fine; Pre Polish; Polish

## Images

![Rock Tumbler Grit Kit Refill for 18lb Tumblers, 4 Step Silicon Carbide & 12,000 Grit Aluminum Oxide Polish, Stone Polishing Kit for Rotary & Vibratory Rock Tumblers - Image 1](https://m.media-amazon.com/images/I/61aeQRPy1vL.jpg)
![Rock Tumbler Grit Kit Refill for 18lb Tumblers, 4 Step Silicon Carbide & 12,000 Grit Aluminum Oxide Polish, Stone Polishing Kit for Rotary & Vibratory Rock Tumblers - Image 2](https://m.media-amazon.com/images/I/71SVNiXuCwL.jpg)
![Rock Tumbler Grit Kit Refill for 18lb Tumblers, 4 Step Silicon Carbide & 12,000 Grit Aluminum Oxide Polish, Stone Polishing Kit for Rotary & Vibratory Rock Tumblers - Image 3](https://m.media-amazon.com/images/I/71ENSH8w-mL.jpg)
![Rock Tumbler Grit Kit Refill for 18lb Tumblers, 4 Step Silicon Carbide & 12,000 Grit Aluminum Oxide Polish, Stone Polishing Kit for Rotary & Vibratory Rock Tumblers - Image 4](https://m.media-amazon.com/images/I/61mhoieNFpL.jpg)
![Rock Tumbler Grit Kit Refill for 18lb Tumblers, 4 Step Silicon Carbide & 12,000 Grit Aluminum Oxide Polish, Stone Polishing Kit for Rotary & Vibratory Rock Tumblers - Image 5](https://m.media-amazon.com/images/I/71u-VNXNY6L.jpg)

## Available Options

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

## Questions & Answers

**Q: Does the polish give the rocks a shiny wet look?**
A: yes but if you have a glaze on your stones, clean of the polish and re-run with plain water and ivory soap. This will get you the wet look you are seeking

**Q: How do i convert oz into tbsp? i have a 1 lb tumbler and it says to add 1oz of grit, how many tablespoons is that?**
A: 1 tbs is half a fluid oz. 
Generally I add about 1 tbs of grit per pound on steps 1 and 2, and half that for steps 3 and 4. Hopefully this helps.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Good value for the quality
*by C***R on July 29, 2026*

Top Notch. Switched from another brand and really love how it's making the rocks shine!!!

### ⭐⭐⭐⭐⭐ Great product deceptive practices
*by B***N on October 4, 2025*

Absolutely wonderful product but where there is a positive there's also a negative. The way the bags are presentoo.Seem like you are getting a lot of product. Once hung in that bag , it comes to less than a half an inch of product on the bottom. Quit the deception quit wasting plastic and if you're gonna cell that smell of quantity. Please do not deceive the customers with the large bag.Cut it down your size

### ⭐⭐⭐⭐⭐ nice grit will buy again
*by W***N on June 2, 2026*

feels good to support a veteran

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---

*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-09-22*