From the manufacturer Makita E-13568 5 Piece Impact Premier Screwbit Set The Makita Impact Premier Torsion bits are a new range of screwbits and sockets, superseding the Makita Impact Gold range of torsion bits, specially designed for use with Impact Drivers. The Impact Premier Torsion range has been specifically designed for high torque demands required by professional users in all industries. Impact Premier screwbits and sockets are constructed from a new material; engineered from special steel with heat treatment, improved hardness (HRC) and the torque value (Nm) to ensure maximum strength and flexibility for a longer lasting bit. The E-13568 consists of the 5 most commonly used double torsion 50mm long bit sizes supplied in a pocket sized plastic holder with a key chain, ideal for attaching to a belt, containing PH2, PZ2, PZ3, T25 and T30. The E-13568 torsion bits are colour coded for easier identification.