Clamping range: 0.3-6.5mm；Handle specification: hex handle (1/4-6.35mm) One-handed Drilling: Gives you the freedom of one-handed drilling and is ideal if you are working in tight spaces Keyless Design: Easily the locks and releases drill bits, quickly convert your quick change hex shank driver unto a drill Made of aluminum alloy, strong, durable and anti-rusting, unlimited used in automotive, garages, warehouses, offices, homes etc Universal driver 1/4-inch hex shank snaps easily into the power screwdriver.(NOTE: It can NOT be used counterclockwise ) Product description Size Name:0.3-6.5mm NOTE: It can NOT be used counterclockwise Features √Instantly convert impact driver to hold non-quick change drill & driver bits √Quickly convert your quick change hex shank driver into a drill √Keyless chuck finger-tightens for easy bit changes √Converts any cordless screwdriver into a drill or grinder to quickly switch tasks and keep the job moving Specification: Driver Shank: 1/4 inch (6.35mm) Hex Shank Clamping Range: 0.3-6.5mm Package Included: 1 x Keyless Drill Chuck