4" (100mm) Zirconia Flap Wheels - 5/8" hole (16mm) your choice of #40 Coarse, #60 medium-coarse, #80 medium or # 120 Fine Grit feel free to ask for any combination of grits A great alternative to grinding wheels, great for fast stock removal and fine polishing Grind, Polish, Deburring, Rust Removal Cool Cutting will not burn (blue) thin metals Extremely Long Lasting, as abrasive wears away it exposes more fresh media Works on: Steel Stainless Steel Aluminum Wood Rubber Plastic