Metabo GE710 Compact 13000 to 34000 Rpm 6.4-Amp Die Grinder Compact Variable Speed, 710-watt Reviewhttp://tinyurl.com/n4pu7ys Metabo GE710 Compact 13000 to 34000 Rpm 6.4-Amp Die Grinder Compact Variable Speed, 710-watt Electronic safety shutdown of the motor if the tool jamsThermal overload protectionAuto-stop carbon brushesHardened and ground collet chuck for precise concentricity of tools in useCollet bore of the collet chuck 1/4 "