Fein Abrasives Delta grinder blade set 630141 - Fein 63717109035, The Fein 63717109035 delta grinder blade set, with hook-and-loop backing, offers a variety of punched grit sizes ranging from 60 to 240. Manufactured by Fein, these sanding discs are ideal for precision grinding and sanding tasks with an 80 mm width across corners. Typical applications include both fine and coarse sanding on wood, metal, and other surfaces. Fein 63717109035 Delta Grinder Blades Grit 60-240 Hook-and-Loop 80mm