【Keychain Bit Holder】6PCS Extension Bar comes with a keychain buckle, which can be easily to install on chain buckles. Compact and portable, easy to carry around. | 【Durable & Strong】This Screwdriver Bits Holder Set is made of high quality aluminum alloy for higher hardness. The powerful ball lock buckle can carry tools up to 500g in weight. | 【Easy to Use】Keychain has a flat, thick and round design, which makes it easier to take the Extension Bar and change the bit with one hand. | 【Higher Efficiency】Thanks to the smooth surface processing and pull-out bushing, can avoid accidental dropping of tools and facilitate high-altitude operations. It can be fitted with a short bit or a long bit. | 【Bit Holder for Drill】Fits for universal 1/4 inch hex shank and 1/4 inch hex socket fit most electric drivers, hand-held drivers and bits. Making this extension holder very handy and flexible!