USAGE: These drill chuck screwdriver adapters can easily turn an electric screwdriver into a drill or a grinder, and can be quickly switched during work to save time and improve work efficiency UNIVERSAL HEX : The drill adapter's universal hexagon handle can be easily inserted into an electric screwdriver, which is easy to use and quick to switch MATERIAL: The drill conversion chuck set is made of steel, rust-proof, wear-resistant and durable, and has a long service life WIDE RANGE OF APPLICATION: These drill chucks have various specifications and can be used for most drill bits and electric screwdrivers; they can be used in cars, garages, warehouses, offices, houses, etc Colour:Black+silver Material:steel Package Contents: 1 * Hex handle 0.3-3.6mm black chuck 1 * Hex handle 0.3-6.5mm silver chuck 1 * Hex handle 0.3-6.5mm black chuck 1 * Hex handle 0.6-8mm black chuck Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.