Wera 454/7 HFT handle screwdriver: Shape to allow high torque transmission in difficult tightening and loosening situations. The ergonomic shape of the handle fills the palm of the hand well, the fingers lie safely in the soft rounded handle recesses. The whole hand makes contact with the handle and friction losses between the hand and the handle are avoided. Holding function (HF) to securely hold the hexagon socket screw on the tool (except size 2 and 2. 5mm)