STAHLWILLE Bit holder 1/4", 3/8" type no. 442

Socket, hexagon 1/4" inside hexagon, DIN 3126/ISO 1173 D 6.3. 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).