2X 0.3-8Mm 1/4 Inch Drill Chuck Wrenchless Screwdriver Impact Wrench Adapter Hex Chuck Drill Grinder Mini Grinding Electric Drill Chuck. Locks and releases drill bits easily. General Hexagonal Input Handle Connecting Rod from 0.3mm to 8mmQuickly turn any cordless screwdriver into a drill or grinder. Use in cars, garages, warehouses, offices, home, etc. Material: Aluminum alloy, color: blackEasy to use and install. Convenient, safe and fast. Easily locks and releases drill bits. Practical and comfortable. Clamping Range: 0.3-8mm Total Length: 38+34mm Shank Diameter: 1/4 (6.35mm) Hex Shank Specific Size as the Picture Shows Package Contents: 2 x Drill ChuckOnly the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement error is +/- 1-3cm.