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 one 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 black metal hanging buckle, compatible for 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 for head and other to transfer. Specifications: Material: aluminum alloy Size: 10x10x2cm/3.94x3.94x0.79in Package Includes: 1 Pcs Screwdriver Bits Holder note: Please allow 0-1cm error due to manual measurement. Make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!