High density, 60 grit Zirconia disk, 4.5" diameter. FootPro Zirconia Flap discs and wheels are suitable for grinding and finishing of welds, and deburring, rust removal and snagging. Also suitable for most ferrous & non-ferrous materials and excellent for surface finishing. Conical shape provides an excellent angle for contour and edge grinding. Best when used at a wider angle of 15 to 25 degrees. HIGH DENSITY = 50% more abrasive material than any other flap disc. 10 discs per box.