The ratchet can be used as a conventional screwdriver in the 0° position by attaching a unique bit-holding adaptor & bit. Quick-release Rapidaptor chuck design allows fast, single-handed bit changes. Chrome Vanadium. Suitable for 1/4" hex drive bits as per DIN 3126-C 6.3 & E 6.3, ISO 1173 & Wera Series 1 & 4.