3- chuck-a drill chuck with a universal key 3- design can firmly fix various tool holders, range 3 adapters-3 different types of adapters can convert your tool into a drill bit, suitable for a of connection needs; 1/4inch hex adapter for screwdrivers, 1/2inch square socket adapter for impact wrenches, The s adapter is used for hammer drill/electric hammer. -Compared with the keyed chuck, the keyless chuck can fix the bit without other tools, avoiding the of holding and finding the key of the small chuck Durability-The chuck is a high-precision thread with a hard rust-proof plastic body and a tight taper. Jaws and springs are made of high-quality steel alloy. All extensions are treated with anti-rust surface to extend the service life. Wide compatibility-This drill chuck adapter tool kit is suitable for gyro screwdrivers, cordless screwdrivers, impact screwdrivers, impact wrenches, hammer drills and certain angle grinders of most on the market. specification Name: Electric drill chuck colour: black Material: plastic + iron size: 6x1.27cm Package Contents: 1 * automatic chuck 1 * electric conversion head 1 * hex post 1 * round post Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.