Free Shipping | 30-Day Returns
Free Shipping | 30-Day Returns
Skip to content
Thumler's Tumbler 4-step Grit & Polish Kit ( AR12 & Model B)

Thumler's Tumbler 4-step Grit & Polish Kit ( AR12 & Model B)

by Thumler's Tumbler
Sale
$74.99
$59.99

Notify me when back in stock

Get beautifully polished stones every time with the Thumler’s Tumblers 4-Step Grit Kit—sized perfectly for the AR12 and Model B rotary tumblers. Each packet is pre-measured for a single large-barrel load, giving you a clean, consistent, and hassle-free tumbling experience from start to finish.

This all-in-one kit includes everything you need to take your rough stones from raw to radiant.

Each kit includes four premium polishing stages:

  • 16 oz. Coarse Grit (60/90 Silicon Carbide) – Shapes and smooths rough stones.

  • 16 oz. Medium Grit (120/220 Silicon Carbide) – Refines and removes coarse scratches.

  • 8 oz. Pre-Polish (500 Aluminum Oxide) – Prepares surfaces for a brilliant shine.

  • 8 oz. Polish (Aluminum Oxide) – Delivers a professional, mirror-like finish.

Engineered to work perfectly with Thumler’s large rotary tumblers—including the AR12 and Model B—this grit kit offers consistent, high-quality results for both beginners and experienced rockhounds. It’s also compatible with most other large-capacity rotary tumblers on the market.

Highlights:

  • Complete 4-stage tumbling system

  • Professional-grade silicon carbide and aluminum oxide

  • Pre-measured packets for large barrels

  • Compatible with most large rotary tumblers

  • Made in the USA

Let customers speak for us

from 31 reviews
Lortone 33B Rock Tumbler
NKD
Does the job!

The Lortone 33B tumbler works great it’s very quiet and easy to use. Love having two tumblers going at one time, makes the job twice as fast! Shipping was free and fast and communication from the Gemstone Lab was excellent.

Lortone 33B Rock Tumbler
Randall H.
Excellent company!

Excellent customer service and follow up. Zero issues.

The Gemstone Lab
CabKing 6 Cabbing Machine
Randall H.
Great machine extremely well packed and delived quickly

Great machine extremely well packed and delived quickly. Thanks Gemstone Labs!

CabKing 6 Cabbing Machine
CabKing 8 Cabbing Machine
Jennifer R.
It's a gem

I couldn't be happier with this purchase. The rig was inspected and packed with great care for shipping. The assembly instructions were easy to follow. The machine operates like a dream. I'm really glad I went for it.

CabKing 8 Cabbing Machine
Donald M.
Great

Great service

The Gemstone Lab
CabKing 8 Cabbing Machine
Donald M.
Everything arrived safely

Everything arrived safely. Outstanding machine. Well thought out.

CabKing 8 Cabbing Machine
Raytech Tumble-Vibe TV-10 Vibratory Tumbler
Cindy J.
I got my vibe 10 Monday put it together but havnt used it yet but its getting close to use it

I got my vibe 10 Monday put it together but havnt used it yet but its getting close to use it. Love it so far

Raytech Tumble-Vibe TV-10 Vibratory Tumbler
Covington Ceramic Media 3/8" diameter
Anonymous
Works

Works ok

Covington Ceramic Media 3/8" diameter
Raytech Ceramalite Tumbling Media 5/8" V-Cut Cylinders
Anonymous
Good

Good filler

Raytech Ceramalite Tumbling Media 5/8" V-Cut Cylinders
sharon b.
Shopping was easy and fast

Shopping was easy and fast. Also the cabbing machine arrived quickly and packaged very well. My husband unpacked it and made sure it ran. He did discover a cracked tray and called customer service. It was corrected very quickly with a replacement. Great company to do business with.

The Gemstone Lab
CabKing 6 Cabbing Machine
sharon b.
This was a gift for my husband

This was a gift for my husband. It arrived on time and packaged very well. He did plug it in and ran it. Although he has not polished anything as of yet.

CabKing 6 Cabbing Machine
James J.
Great place to make purchases

Very easy to navigate their website - prices are good - response and delivery time is great and they follow up with you; the Gemstone Lab is an awesome resource

The Gemstone Lab
Raytech Tumble-Vibe TV-10 Vibratory Tumbler
Stephen B.
Everything arrived in good shape and delivery was smooth

Everything arrived in good shape and delivery was smooth. Haven't gotten started yet with the tumbler so can't tell you about how it works. The instructions didn't tell me how to attach the bowl to the base! Had to learn that from a You-Tube video! Haven't plugged it in yet.

Raytech Tumble-Vibe TV-10 Vibratory Tumbler
Covington Silicon Carbide Graded Abrasive Grit - Various Sizes
Clarence S.
Good

Good product

Covington Silicon Carbide Graded Abrasive Grit - Various Sizes
John
Great Store

Web site is easy to navigate and the customer service is great. Very fast shipping also.

The Gemstone Lab
Customers rate us 4.7/5 based on 31 reviews.

Get beautifully polished stones every time with the Thumler’s Tumblers 4-Step Grit Kit—sized perfectly for the AR12 and Model B rotary tumblers. Each packet is pre-measured for a single large-barrel load, giving you a clean, consistent, and hassle-free tumbling experience from start to finish.

This all-in-one kit includes everything you need to take your rough stones from raw to radiant.

Each kit includes four premium polishing stages:

  • 16 oz. Coarse Grit (60/90 Silicon Carbide) – Shapes and smooths rough stones.

  • 16 oz. Medium Grit (120/220 Silicon Carbide) – Refines and removes coarse scratches.

  • 8 oz. Pre-Polish (500 Aluminum Oxide) – Prepares surfaces for a brilliant shine.

  • 8 oz. Polish (Aluminum Oxide) – Delivers a professional, mirror-like finish.

Engineered to work perfectly with Thumler’s large rotary tumblers—including the AR12 and Model B—this grit kit offers consistent, high-quality results for both beginners and experienced rockhounds. It’s also compatible with most other large-capacity rotary tumblers on the market.

Highlights:

  • Complete 4-stage tumbling system

  • Professional-grade silicon carbide and aluminum oxide

  • Pre-measured packets for large barrels

  • Compatible with most large rotary tumblers

  • Made in the USA

Shipping Information

Free Ground Shipping in the continental USA.

At the Gemstone Lab, we aim to deliver your lapidary tools and supplies quickly and safely.

That's why we only ship using UPS, FedEx, or USPS.

We offer free ground shipping on all orders within the United States. No minimum purchase is required -  every order qualifies! Our ground shipping is handled by trusted carriers to ensure your items arrive safely and on time.

What to Expect When You Place an Order

Once your order is confirmed, you'll receive a confirmation email detailing your purchase and order number. As soon as your order is shipped, you wlll receive a notification with all shipping details and a tracking number so you'll know exactly when your package will arrive. 

Fast Order Processing

We start processing your order right away. Most orders ship withing 1-2 business days, so you can get started on your next project before you know it. 

Shipping Times

Delivery times vary based on your location. Most U. S. order arrive within 3-6 business days. Expedited shipping options are also available at checkout for certain items for an additinal fee if you needs a product sooner. Made to order products cannot be guaranteed withing this timeframe are is noted on each product page. 

International Shipping

We currently do not offer shipping outside of the United States.

Secure Packaging

Every order is carefully packed to ensure your items arrive in perfect condition. Fragile tools, blades, and other delicate lapidary items are given extra care during packaging and boxing to prevent damage in transit.

 

If you have any question about our shipping policies or need assistance with a product, please don't hesitate to reach out to our friendly customer support team. We're happy to help make your lapidary adventure more fun in any way we can! Give us a call at 855-487-9637.