Made of high quality aluminum alloy, this chuck is durable and rust resistant. The 1/4 hex shank is suitable for most power tools such as electric drill, grinder, the screwdriver. 0.3-6.5mm clamping capacity, easily clamping different size drill bits. Allows the hex head drill to use conventional drill bits. Keyless design, convenient to hold or release the bit in a short time. The universal 1/4 hex shank screwdriver 4 in. easily snaps into power screwdriver. General 0.3mm to 6.5mm hex handle input connection shank Hold drill bits and bits accessories up to 1.4 inches in diameter. Easily locks and unlocks drill bits, quickly convert your quick-change hex shank screwdriver into a drill. Use in automobiles, garages, warehouses, offices aux, home, etc. Features: 0.3-6.5mm clamping capacity, easily clamps different size drill bits. Allows the hex drive drill to use conventional drill bits. No more picking up two drill bits, just insert this chuck for lighter drilling tasks with your drill percussion. Instantly convert the impact driver to hold non-quick change drill bits and screwdrivers, easy to use and improve your work efficiency.