Wera Rapidaptor 889/4 Universal Quick Release Bit Holder 50 mm. Carded WER073421 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. Shank 1/4 in. WER073421.