Wera 816 Bitholding Screwdriver with Rapidaptor Quick-Release Chuck – 1/4″. High quality bit holder. The Rapidaptor quick-release chuck enables rapid bit change without needing any special tools. The strong permanent magnet holds the bits absolutely securely. Kraftform Plus handle for pleasant ergonomic working that makes blisters and calluses a thing of the past.Hard gripping zones for high working speeds whereas soft zones ensure high torque transfer. Suitable for bits with 1/4″ hexagon head drive as per DIN ISO 1173-C 6.3 and E 6.3 (ISO 1173).