Wera screwdrivers of this safety pattern far exceed the requirements of relevant standards regarding strength & torque stability. Safety guarantee individual testing of the tool for dielectric breakdown strength at 10.000 Volts in a water bath & 1000 volt safe working. The handle is of ergonomic design for faster more powerful & less tiring screwdriving action & has anti roll feature. Set of 71 each of the following: Slotted: 2.5 x 80 mm., 3.5 x 100 mm., 4.0 x 100 mm., 5.5 x 125 mm. Phillips: PH1 x 80 mm., PH2 x 100 mm. Voltage tester 3.0 x 70 mm.