How many do you get for 16.58?

Just one of them. It is a 2" 50 grit (green) Roloc disc. You also will need the Roloc 2" adapter if you do not have it already. These bristle discs do last a long time though.

Is this product used with a regular grinder?

These bristle discs come in different sizes, as well as different grits. They come in 2",3" and 4 1/2" The 2" ones shown here, attach to a roloc adapter that ends in a 1/4" shaft. It is intended to be used in a die grinder which come straight or right angle. The large 4 1/2" discs are intended for use in a regular right angle grinder. They are also made in wheel form for use on a bench grinder. BTW the roloc adapters also accept Scotch Brite pads of various grits. These are expensive; the 4 1/2 ones are REALLY expensive

Do you recommend using these for carbon buildup on piston heads?

Maybe use one of the the higher grit ones yes. They work quite well. Used one to clean the heads on our explorer when we rebuilt the engine just don't dig into and put a lot of pressure on it let the bristles do the work

Looking for something to scuff between layers of fiberglass and epoxy on a boat, would this be easier than by hand or a orbital sander?

These guys are pretty small so think about surface area. Personally I tried work bigger than 2 square feet and eventually moved to other tools

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3M 3M-18730 Roloc Bristle Disc Grade - 50, Size - 2

Product ID: 303361373

Details

Brand
3M
Compatible devices
Angle Grinder
Grit material
Ceramic
Grit type
Medium
Product dimensions
5.1L x 5.1W

🔥Grade 50 ceramic alumina grit

🔧2-inch diameter for precision

⚙️Max 25,000 RPM spin speed

₩122571

Duties & taxes included

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Sold byAmazon South KoreaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡️ Spin into flawless finishes with 3M’s Roloc Bristle Disc!

TRUSTED 3 M QUALITY - Backed by 3M’s industry-leading innovation and a 4.6-star rating from 791 professionals who demand the best.
COMPACT VERSATILE - 2-inch diameter disc designed for detailed work, perfect for deburring, blending, and polishing in tight spots.
CERAMIC ALUMINA GRIT - Durable Grade 50 abrasive ensures efficient scratch removal, rust elimination, and surface finishing.
PRECISION POWERHOUSE - Engineered for high-speed 25,000 RPM performance to tackle tough automotive aluminum and metal tasks with ease.
QUICK CHANGE CONVENIENCE - Roloc attachment system lets you swap discs in seconds, keeping your workflow seamless and uninterrupted.

The 3M 18730 Roloc Bristle Disc is a 2-inch, Grade 50 ceramic alumina abrasive tool designed for automotive aluminum and metal work. Operating at up to 25,000 RPM, it excels in deburring, polishing, and rust removal with a quick-change Roloc system for maximum efficiency. Trusted by professionals, it combines precision, durability, and convenience in one compact disc.

Specifications

ASIN	B002P55TX6
Best Sellers Rank	#233,220 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #21 in Bristle Discs
Brand Name	3M
Compatible Devices	Angle Grinder
Compatible Material	Aluminum & Metal
Construction Type	Coated
Customer Reviews	4.6 4.6 out of 5 stars (837)
Grit Material Type	Ceramic Alumina
Grit Number	50.0
Grit Type	Medium
Included Components	3M 3M-18730 Roloc Bristle Disc Grade - 50, Size - 2
Industry Standard Identifier	3M-18730
Item Diameter	2 Inches
Item Dimensions	5.1 x 5.1 x 5.1 centimeters
Item Dimensions L x W	5.1L x 5.1W centimeters
Item Type Name	3M 3M-18730 Roloc Bristle Disc Grade - 50, Size - 2
Manufacturer	3M
Material Type	Ceramic Abrasive Grain
Maximum Rotational Speed	25000 RPM
Model	048011-18730
Number of Items	10
Number of Packs	1
Part Number	MMM4801118730
Recommended Uses For Product	Polishing, Rust Removal
Set Name	Single
UPC	048011187303
Unit Count	1 Count

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