411Penumatic Screwdrivers 　 Bolt capacity 　M6-M8 13/61-5/16in 　Free speed 　8500rpm 　Max Torque 　61Nm 　Weight 　1.0kg 　Square drive 　6.3mm 1/4 in 　Air inlet thread 　ZG1/4"-19 Working Air Pressure 　0.40MPa-0.8MPa 　Test Air pressure 　0.63MPa We are Zhejiang Jinyi Electric Tools Co.,Ltd. in china.We supply electric tools,water pump,grinding wheel and air tools with good quality and low price. If you have any query,Please contact us to know details.