The Trend SNAP/HKLC/6 Keyless Chuck can be used in quick chucks and impact drivers to hold parallel shank drills bits up to 1/4 inch.Clamping capacity: 0.8 mm (1/32 inch) to 6 mm (1/4 inch). Enhanced gripping power when compared to traditional key type drill chucks. Lightweight with plastic body. Fitted with snappy shank 1/4 inch hex shank adaptor. Specifications: Shank Diameter: 1/4in hex. Clamping Capacity: 0.8-6mm (1/32-/14in). Ref: UTTK3939