Wera Bit-Box 20 BTH PZ2 20 Pc Bit Set 05057762001 This Wera Bit-Box includes 20x Premium BiTorsion PZ 2 screwdriver bits for manual and power tool use. The bits are stored securely in a practical Bit-Box which are accessible via a slide switch.  These bits come with an elastic torsion zone where kinetic energy is diverted to when peak loads prevail, and a softer BiTorsion zone to prevent the bit tip from twisting during peak loads - this significantly prolongs the product\'s service life. FEATURES Designed for use in timber screws in drills/drivers Ductile and tough for hard materials BiTorsion zone to absorb peak loads 1/4\" hexagon drive (Wera connecting series 4) Take it easy tool finder: colour coding according to profile and size In practical Bit-Box for simple removal CONTENTS 20 x BTH BiTorsion Extra-Hard Bits PZ2 x 25mm