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Cardboard box containing four labeled bags of rock tumbling grit and polish

RTumbler, LLC

RTumbler, LLC 4-Step Rock Tumbler Grit Kit 15 lb

SKU CH-975X-MGSXG

Four-step silicon-carbide and aluminum-oxide grit kit with instructions for a 15-pound rotary or vibratory tumbler

  • Product typeScience
  • Age groupAdult
  • Suitable forUnisex
  • Complete 4-step polishing kit for 15 lb tumblers
  • Coarse 60/90 silicon carbide removes material quickly
  • Medium 120/220 silicon carbide refines surfaces smoothly
  • Fine 500 silicon carbide pre-polishes for final shine
  • 1200 aluminum oxide polish delivers professional luster

4-Step Grit Kit for 15 lb Tumblers

This kit supplies the complete abrasive sequence for a 15 pound rotary or vibratory tumbler. It contains four distinct grades of silicon carbide and aluminum oxide designed to take rough stone through to a polished finish. The set is manufactured in America and includes printed step-by-step directions with a measurement chart. It suits hobbyists and educators running geology or STEM projects.

Check Tumbler Capacity and Type

Verify that your machine is rated for a 15 pound load or can accommodate five separate 3 pound batches. The grit is compatible with all rotary and vibratory tumblers, but the barrel or bowl must hold the stated volume. Ensure you have enough rough material and water to fill the chamber to the recommended level before starting the first coarse stage.

Ideal for Full-Cycle Polishing, Not Single-Stage Use

This product suits users who want to run the entire four-stage process from 60/90 coarse through 1200 polish. It is not intended for buyers who only need a single grit size or a smaller quantity for a 3 lb tumbler. Anyone without a tumbler capable of the required capacity should look at alternative kits.

How it compares

Measured against everything we stock in STEM Kits & Building Blocks, at today’s prices. Recalculated every night.

Price $17.99
Cheaper than about 69% of the 236 comparable items (median $28.99).

Specifications

Product
Product typeScience
More details
Age groupAdult
Suitable forUnisex

Questions about this item

What grits and amounts come in the kit, and is anything else needed to start tumbling?

The kit contains 1 lb of 60/90 coarse silicon carbide, 1 lb of 120/220 medium silicon carbide, 1/2 lb of 500 fine silicon carbide pre-polish, and 1/2 lb of 1200 aluminum oxide polish, plus step-by-step instructions; no extra consumables are required.

Should I choose this kit for a 15-pound rotary tumbler or for smaller barrels?

The quantities are sized for one full 15-pound barrel load and can also be split across five 3-pound runs in either rotary or vibratory tumblers.

What do the mesh numbers on each grit stage mean for the finish I will get?

The 60/90 and 120/220 stages remove rough edges, the 500 pre-polish smooths the surface, and the 1200 aluminum oxide stage produces the final polished shine.

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