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KoolStone 4 lb Rock Tumbler Grit and Ceramic Media Kit1 / 7
Product guide

KoolStone 4 lb Rock Tumbler Grit and Ceramic Media Kit

The KoolStone Rock Tumbler Grit and Ceramic Media Kit is a four-step refill set for rotary or vibratory tumblers. Its listed stages run from coarse silicon carbide through 1200-grit aluminum oxide polish, with ceramic media for cushioning and barrel balance. The listing says the set can process up to 25 lb of rocks across multiple batches.

At a glance

  • Four grit stages are supplied, including a final 1200-grit aluminum oxide polish.
  • The set includes 1 lb of ceramic tumbling media, which the listing says can be used to cushion stones and improve barrel balance.
  • Listed as compatible with rotary and vibratory rock tumblers.
  • The listing claims enough grit and media to process up to 25 lb of stones across multiple batches.
Price
$26.99Save 18%

Reference price: $32.98

Price checked: Nov 14, 2026

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Pros and cons

Pros

  • A full four-stage progression is included, so buyers can start from coarse shaping and continue through final polish without sourcing each listed grit separately.
  • Ceramic media is part of the kit and is described as useful for cushioning stones and balancing the barrel.
  • Usage guidance gives a suggested grit amount and stage duration, which can help new hobbyists plan a batch.

Technical specifications

16 specifications
Identity
BrandKoolStone
Set name4 Pound Rock Tumbler Grit Kit
Part numberDKLLC-GRIT4LBS-US
Kit contents and stages
Step 11 lb of 60-grit coarse silicon carbide
Step 21 lb of 150-grit medium silicon carbide
Step 3½ lb of 600-grit fine silicon carbide
Step 4½ lb of 1200-grit aluminum oxide polish
Ceramic tumbling media1 lb
Packs5
Materials and compatibility
Material listedAluminum Oxide, Ceramic, Silicon Carbide
Grit material listedCeramic, Plastic
Compatible materialsGlass, Metal, Stone
Tumbler compatibilitySuitable for both rotary and vibratory tumblers
Use and stated capacity
Rock capacity claimPolish up to 25 lbs. of Rocks
Suggested grit per pound of stonesabout 2 tablespoons (≈25–30 g) of grit per 1 lb of stones in each stage
Suggested duration7–10 days per step

What to know before buying

Listing details to confirm

The listing's headline describes a 4 lb kit, while its listed stage weights total 3 lb of grit plus 1 lb of ceramic media. The specifications also call the grit type “Medium” and grit number “1200,” although the feature details describe four distinct grits from 60 to 1200. Verify the selected listing's contents and labels if those details matter.

What’s in the box

Included
  • Step 1: 1 lb of 60-grit coarse silicon carbide
  • Step 2: 1 lb of 150-grit medium silicon carbide
  • Step 3: ½ lb of 600-grit fine silicon carbide
  • Step 4: ½ lb of 1200-grit aluminum oxide polish
  • 1 lb ceramic tumbling media

Who is it for?

A good fit for

  • Rock tumbling hobbyists who want a four-stage grit refill and ceramic media in one set.
  • Users of rotary or vibratory tumblers who are processing stones in multiple batches.
  • Beginners who want stage-by-stage grit amounts and general tumbling guidance.

Less suited to

  • Buyers seeking a rock tumbler machine, since this listing describes grit and tumbling media rather than a tumbler.
  • Anyone needing a separately specified extra-fine polish beyond the listed 1200-grit final stage.
KoolStone 4 lb Rock Tumbler Grit and Ceramic Media Kit · photo 2
Additional product photo 2

Customer reviews on Amazon

4.6 / 5 · 296 ratings
  • 5 stars80%80%
  • 4 stars10%10%
  • 3 stars4%4%
  • 2 stars3%3%
  • 1 star3%3%

Customer feedback highlights perceived media quality, a useful selection of grit levels, value, and shiny results. That feedback is relevant to buyers choosing a multi-stage refill, though reported outcomes do not guarantee a particular finish. The overall rating distribution is mostly five-star but includes lower-star ratings, so experiences are not uniform.

Positive themes

  • Customers are reported to appreciate the media quality and range of grit levels.
  • The feedback summary mentions stones coming out with a shiny finish and beautiful luster.
  • Value for money is mentioned positively in customer feedback.

Frequently asked questions

What grit stages are listed in this kit?

The listing describes 60-grit coarse silicon carbide, 150-grit medium silicon carbide, 600-grit fine silicon carbide, and 1200-grit aluminum oxide polish.

How much rock can the kit process?

The listing claims it can process up to 25 lb of rocks across multiple batches. Results and quantity used may vary with the stones and tumbling process.

How much grit and how long should each stage use?

The listing suggests about 2 tablespoons, or approximately 25–30 g, per pound of stones for each stage, with 7–10 days per step. It also advises adding enough water to cover the stones and adjusting time for stone hardness and size.

Does it include a tumbler?

The supplied contents identify polishing grit, and the product is presented as a refill media kit. No tumbler machine is specified as included.

KoolStone 4 lb Rock Tumbler Grit and Ceramic Media Kit · photo 3
Additional product photo 3

Alternative options

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