... , flap disc, flap wheels, etc. for wood, metal, stainless steel 1. Aluminum oxide grain, for making sand belt, flap disc, flap wheel ... , for wood, metal, stainless steel polishing2. Silicon carbide grain, for ... Zirconia grain, for making flap disc, sand belts, for stainless steel polishing4. size : there are so many kinds of sizes, and ...