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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Description

🛠️ Elevate your metalwork game with precision and speed!

HIGH SPEED EFFICIENCY - Operates at up to 25,000 RPM to accelerate your workflow without sacrificing quality.
PRECISION TAPERED DESIGN - 2-inch diameter with tapered edges for detailed work on automotive metals.
TRUSTED AUTOMOTIVE GRADE - Specifically engineered for aluminum and metal surfaces, ensuring professional-grade results.
UNMATCHED SURFACE CONTACT - Flexible bristles maximize abrasive coverage for faster, smoother finishes.
LONG LASTING ABRASIVE POWER - Ceramic and aluminum oxide blend retains sharpness throughout the disc’s life.

The Scotch-Brite™ Roloc™ Bristle Disc RD-ZB is a 2-inch, 50 grit abrasive tool designed for automotive aluminum and metal. Featuring a proprietary ceramic and aluminum oxide abrasive blend molded into flexible bristles, it offers superior surface contact and long-lasting sharpness. Operating at speeds up to 25,000 RPM, this tapered disc delivers precise, efficient finishing for professional-grade results.

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