Used most often in the automotive and aerospace industries, this 20 piece screwdriver bit set emphasises the optimum weight to strength ratio, which ensures the reliability and accessibility that is so important in this type of production environment. The set is designed for insertion and removal of fasteners and fixings using 1/2in. square drive tooling. The unique knurled body of the bit gives extra grip which is essential for a quick tool change when your hands are greasy/oily, whilst the chrome vanadium steel construction and chrome plated mirror finish and aluminium-free design makes for durability. All bits have ball retaining groove on each face of the square drive. The set is supplied in a robust plastic case. Features and Benefits Fully chrome plated mirror finish for an easy tool clean Ideal for automotive and aerospace industries Ball retaining groove on each face of the square drive ensures a positive lock with fasteners Manufactured from chrome vanadium steel for du