Selected from aluminum. Includes 6pcs screwdriver bit holder extensions and carabiner. Remove Bit by pulling back the external metal hook during disassembly. Most Bit used in different electric driver and handheld driver fit to our 1/4 bit holder. This make this drill Bit holder highly practical for your Tool & home improvement. Suitable for carrying frequently used Bit. Suitable for various power screwdriver, handheld screwdriver, and drill. Can also be used as a Keychains. 1/4" shank suitable for most drill. Suitable for home, auto, woodworking, and professional use. Each bit is and Releasing. Bit Keychains Holder keep your Bit organized and make easy to transport whenever you go., Manufacturer: Vynetra