Wera's Rapidaptor Universal Bit Holder is designed for rapid bit changes. Rapidaptor allows for quick one-handed bit change for both insert and power bits. Bits are easily inserted with press-in and self locking mechanism that holds bit securely and wobble free. Free-spinning outer sleeve stabilizes tool during screwdriving process, easily applying tool to screw to prevent slipping. Fits all 1/4” DIN 3126-C 6.3 and E 6.3 bits and Wera Series 1 and 4. Wera – The Best Tools For The Job!