Fein Abrasives Delta grinder blade 630140 - Fein 63717084013, Fein manufactures the Delta grinder blade, product number 63717084013, featuring a hook-and-loop-backed design for easy attachment. The unperforated sanding discs have a grit size of 100 and a width across corners of 80 mm. These discs are ideal for grinding and finishing applications in various materials. Fein 63717084013 Delta Grinder Blade Grit 100 80mm Hook-and-Loop