2 Satin Finish Buffs Great For Polishing Jewelry. This is a new set of two 3/4" (19 mm) satin finish buffs. These are great for polishing jewelry and dentures. These buffs are for use at speeds of up to 30,000 RPM. They can be used with a Dremel tool. Each shank measures approximately 3/32" (2.4 mm) in diameter.