Usage: These drill chuck screwdriver adapters can easily turn an electric screwdriver into a drill or grinder and can be quickly switched during the work process to save time and increase work efficiency Universal Hex: Universal Hex for Drill Bit Adapters The handle can be easily inserted into the electric screwdriver. The screwdriver is easy to use and quick to switch. Material: The drill bit conversion chuck set is made of steel, which is rust-proof, wear-resistant, durable and has a long service life. Wide range of applications: These drill bit chucks are available in various specifications and can be used with most drill bits and electric screwdrivers; they can be used in cars, garages, warehouses, offices, houses, etc. Color: Black + Silver Material: steel Package list: 1 * Hex handle 0.3-3.6 mm Black Chuck 1 * Hexagonal handle 0.3-6.5mm Silver collet 1 * Hex handle 0.3-6.5mm Black Chuck 1 * Hex handle 0.6-8mm