These wera kraftform plus screwdrivers have a laser treated blade tip that result in a rough surface that is hardened up to 1000 vickers this ensures that drive end bites into the screw head reducing slipping and the resulting damage that can occur to the screw head and surfaces additionally higher levels of torque are transferred to the screw and the blade life is extended ergonomic kraftform handles fit comfortably in the hand with special hard and soft zones to provide better turning power wi