Wera Kraftform 27 Piece Adjustable Torque Screwdriver set is designed for torque controlled tightening to guarantee the safety of the screw connection. Torque can easily be set to the required scale value by hand without special tools. Measurement accuracy is +/- 6% in accordance with standard EN ISO 6789. Wera torque tools have unlimited loosening torque to loosen seized screws. All Wera hand tools feature the trademarked ergonomic Kraftform handle, with hard and soft zones, that fits the shape to the hand for the ultimate in comfort and high-speed torque transfer. Adjustable torque screwdrivers feature the Rapidaptor bitholder with quick-release chuck that allows for speedy one-handed bit insertion and removal for insert and power bits. Calibration certificate included. Limited Life Time Warranty. Set contains 1 x 7400 Adjustable Torque screwdriver with Rapidaptor, range 0.3-1.2 Nm, 1 x 7441 Adjustable Torque Screwdriver with Rapidaptor, range 1.2-3.0 Nm, 1 x 7442 Pistol Handle Adjustable Torque Screwdriver with Rapidaptor, range 3.0-6.0 Nm and 24 carbide insert bits, 6 Hex bits 2mm, 2.5mm, 3mm, 4mm, 5mm, 6mm; 9 Torsion (TZ) TORX bits TX6, TX7, TX8, TX9, TX10, TX15, TX20, TX25, TX30; 9 TORX PLUS bits 6 IP, 7 IP, 8 IP, 9 IP, 10 IP, 15 IP, 20 IP, 25 IP, 30 IP. Includes durable storage case with molded insert. Wera The Best Tools For The Job!