1. The keychain extension rod is made of aluminum alloy for Tools & Home Improvement, and the interior is not completely empty. It can be fitted with a short bit or a long bit. 2. This keychain has a flat, thick and round design, which makes it easier to take the product and change the bit with one hand. 3. The smooth surface processing and pull-out bushing can avoid accidental dropping of tools and facilitate high-altitude operations. 4. The powerful ball lock buckle can carry tools up to 500g in weight. 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. You can also use the keychain post with your favorite carabiner according to your needs. 7. Extend all kinds of screwdriver bits, screwdriver head conversion uses. Universal 1/4 inch quick hex shank and 1/4 inch hex socket fit most electric drivers, hand-held drivers and bits. 8. Compact and portable, easy to carry around. Suitable for drill, screwdriver, batch head and other to transfer. Note: Screwdriver Bits Holder only, other accessories demo in the picture is not included. Specifications: Material: Aluminum Alloy Size: app.60 mm/2.36in Colors: Blue, Red, Black, Green, Yellow, Sliver Package Including: 1 x Screwdriver Bits Holder