The Bosch Keyless Drill Chuck offers comfortable, keyless operation for maximum ease of use. It allows for easy and fast one-handed clamping without using a key and securely fastens cylindrical or hex shank drill bits. These keyless chucks from Bosch have 1/4in. (6.3mm) hexagonal shanks and a capacity of 1-6mm. They are compatible with most common drills with spindle lock. Please check technical details for information regarding impact resistance or suitability for anti-clockwise rotation.