Quick & quick-release chuck fits for Bits Wera series 1 & 4. For 1/4 in. DIN 3126- C 6, 3 und E 6, 3 (ISO 1173) hexagon insert bits & Wera Series 1 & 4 Rapidaptor easy-in, easy-out, rapid-spin, chuck-all & single-hand technology, with ring magnet & stop sleeve for secure screw driving on the holder 1/4 in. hexagon suitable for power tools with DIN 3126- F 6, 3, ISO 1173 receiver.