Full set of 1/4" and 3/8" heads Great for smoothing out excess weld beads Can be used with any Eastwood or other branded 1/4" arbor die grinder Contents 8 Cardibe Burrs and Storage Case Max. RPM: 30.000, Arbor Size: 1/4", For Use On: Steel, Cast Iron, Stainless Steel, Aluminum and Copper