[Application] Universal 1/4 inch (about 0.6 cm) hex shank and 1/4 inch (about 0.6 cm) hex socket, convenient for placing various 1/4 inch (about 0.6 cm) commonly used drill bits. Suitable for most electric screwdrivers, hand screwdrivers and drills such as t25 and t20 drills, etc. [] The drill socket adapter is made of metal, which is , lightweight and strong, which ensures its service life. [How it works] Bit holder keychain has a ball bearing to hold the bits, and function as a slide or a pressure lock. This allows you to easily change the drill bit with one hand. [Large capacity] The Powerball lock of the drill holder can carry drilling tools weighing up to 500 grams. The drill bit is not easy to drop. 1/4 Inch Hex Shank Screwdriver Bit Holder: The set includes 1/4 inch hex shank keychain extension rods with black metal hanging loops compatible with most 1/4 speed hex handles and 1/4 hex sockets and an assortment of electric screwdrivers, hand screwdrivers and drill bits. Portable