Features: Material: The keychain extension rod is made of aluminum alloy and the interior is not completely empty. It can be fitted with a short bit or a long bit. Design: This keychain has a flat thick and round design which makes it easier to take the product and change the bit with one hand. Smooth: The smooth surface processing and pull-out bushing can avoid accidental dropping of tools and facilitate high-altitude operations. Large Load: The powerful ball lock buckle can carry tools up to 500g in weight. Easy Install: Large-diameter flat-mouth rings are easy to install on chain buckles. With Hanging Buckle: Comes with a chain buckle which can be hung on a belt. You can also use the keychain post with your favorite carabiner according to your needs. Function: Extend all kinds of screwdriver bits screwdriver head conversion uses. Application: Universal 1/4inch quick hex shank and 1/4inch hex socket fit most electric drivers hand-held drivers and bits. Portable: Compact and portable easy to carry around. Suitable For: Suitable for drill screwdriver batch head and other to transfer. Specifications: Item Type: Screwdriver Bits Holder Set Material: Aluminum Alloy Color: Multicolor Hole Diameter: About6.5mm/0.26inch Package Includes: 6Pcs x Screwdriver Bits Holder 1Pc x Key Buckle Notes: Transition: 1cm=10mm=0.39inch 1. Due to the different monitor and light effect the actual color of the item might be slightly different from the color showed on the pictures. Thank you! 2. Please allow 1-3cm measuring deviation due to manual measurement.