Features: 1. Extend all kinds of screwdriver bits, screwdriver head conversion usesUniversal 1/4inch quick hex shank and 1/4inch hex socket fit most electric drivers, hand-held drivers and bits. 2. 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. 3. This keychain has a flat, thick and round design, which makes it easier to take the product and change the bit with one hand. 4. The smooth surface processing and pull-out bushing can avoid accidental dropping of tools and facilitate high-altitude operations. 5. Large-diameter flat-mouth rings are easy to install on chain buckles. 6. Comes with a chain buckle, which can be hung on a belt. Suitable for drill, screwdriver, batch head and other to transfer. 7. You can also use the keychain post with your favorite carabiner according to your needs. 8. Compact and portable, easy to carry around. Specifications: Material: Aluminum Alloy Size: 6 cm / 2.36 in Colors: Blue, Red, Black, Green, Yellow, Sliver Package Listing: 29 x Screwdriver Bits Holders 3 x Black Carabiners 2 x Connection rods