Series 7400 ESD Kraftform adjustable torque screwdrivers (2.5-29.0 in.lbs.) with Rapidaptor quick-release chuckApplication: Suitable for 1 4" DIN ISO 1173 C 6. 3 and E 6. 3 hexagon insert bits and Wera Series 1 and 4 Design: Rapidaptor rapid in, rapid out, rapid spin, chuck all and single hand technology, non magnetic Accuracy:6 % (DIN EN ISO 6789). Numerical torque value scale. Reliable slipping mechanism and acoustic signal when reaching the set torque. Handle: Kraftform with non roll feature, multi component