Application: For 1/4 in. DIN 3126- C 6, 3 und E 6, 3 (ISO 1173) hexagon insert bits & Wera Series 1 & 4 Design: Rapidaptor easy-in, easy-out, rapid-spin, chuck-all, & single-hand technology, with strong permanent magnet Capacity 1/4 in. hank 1/4 in. ength 50 m.