This Mibro 5-Piece Mounted Grinding Stone Set is a useful addition to any tool set. The set includes a 3/4 in. x 1-1/8 in. conical, 3/4 in. x 1-1/8 in. pointed, 5/16 in. spherical, 7/16 in. x 7/8 in. cylindrical and 3/4 in. x 1 in. cylindrical grinding stone. The maximum RPM of each bit is 25,000 RPM.

Aluminum oxide in a vitrified bond removes material quickly
1/4 in shank to fit all drills
Range of shapes to get into the tightest spot
Includes a 3/4 in. x 1-1/8 in. conical, 3/4 in. x 1-1/8 in. pointed, 5/16 in. spherical, 7/16 in. x 7/8 in. cylindrical and 3/4 in. x 1 in. cylindrical mounted grinding stone
Max. RPM 25,000