Features and Benefits: , Should not exceed maximum 30,000 RPM, All burrs are 1/4"" shank, USA standard, Blow molded storage case for easy storage and transport Set includes: , SA-5: Cylindrical shape 1/2"" x 1"", SA-3: Cylindrical shape 3/8"" x 3/4"", SC-3: Cylindrical radius end 3/8"" x 3/4"", SC-1: Cylindrical radius end 1/4"" x 5/8"", SD-1: Ball shape 1/4"", SD-3: Ball shape 3/8"", SF-3: Tree shaped radius end 3/8"" x 3/4"", SF-5: Tree shaped radius end 1/2"" x 1"" SKU: ISN10792