Reversible, 22 teeth, with 2-component handle and inside hexagon, 1/4", DIN 3126/ISO 1173 D 6.3 for Bits Screwdriver sockets 1/4".
Internal hex drive with a collar-thrust spring (registered design). Bits are easy to insert, lock securely in position and can be removed just as easily;
even hex bits with a wide groove (Type E, DIN 3126/ISO 1173).