0.3 - 6.5mm The chuck is small in size and light in weight, which will not bring extra burden to your operation Easily convert your cordless electric screwdriver into a drill to quickly switch between different tasks, reducing the time needed for a project 1/4" hex shank fits power tools more easily and securely Classic 3-jaw keyed design securely holds a wide range of twist drill bits conveniently; " Versatile use on impact drills and electric screwdrivers to quickly switch tasks and keep work moving; Features: Suitable accessories: Easy to use and easy to install, safe, fast, 1/4 inch hex key card is easy access to the electric screwdriver. Function: These keyless drill chucks can easily turn a cordless electric screwdriver into a drill or grinder to quickly switch tasks and keep work progress; They are essential accessories for power tools. Wide range of applications: These drill chucks have various specifications and can be adapted to most cordless electric drills and screwdrivers. They can be applied in cars, garages, warehouses, offices, homes, etc. Loading and unloading easy: This keyless chuck converter can go from driving to drilling in seconds, and also gives you the freedom to drill with one hand, which is ideal for working in tight spaces. Features: Material: Metal Color: Black, Silver Package Includes: 2 x Keyless Chucks