Metabo GE 950 G Plus 8.5-Amp 950-watt High Torque Die Grinder Variable Speed, 2500 - 8,700 RPM High torque thanks to robust and quiet planetary gear train Spindle lock for simple change of tools Thermal overload protection Hardened and ground collet chuck for precise concentricity of tools in use Collet bore of the collet chuck 1/4 "