Features: *The keychain extension rod is made of Premium aluminum alloy, and the interior is not completely empty. It can be fitted with a short bit or a long bit. *This keychain has a flat, thick and round design, which makes it easier to take the product and change the bit with hand.The smooth surface processing and pull-out bushing can avoid accidental dropping of tools and facilitate high-altitude operations. *Package includes 7 pieces of 1/4 hex shank handle keychain extension rod with a hanging buckle, compatible w/ most 1/4 fast hex handles and 1/4 hex sockets and various electric screwdrivers, hand-held screwdrivers and drill bits. *Large-diameter flat-mouth rings are simple to install on chain buckles. *Mini and portable,easy to carry around.Great for drill, screwdriver,batch head and other to transfer. Specifications: Product name: Screwdriver Bits Holder Material: Aluminum alloy Color: Colorful Size: (Approx. ) 38mm Suitable for: screwdriver bits with a 1/4 inch hex shank Quantity: 7x keychain extension bars +1 x Metal buckles Package Included: 7 x Keychain Extension Bars 1 x Metal Buckles Note: 1.Transition: 1cm=10mm=0.39inch. 2. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 3. Please allow slight manual measurement deviation for the data.