[Durable and strong material]Made of aluminum alloy, high hardness and good toughness, sturdy and durable. Hex shank twist drill bits can be inserted, easy to use and very convenient.[Fine workmanship]The surface is smooth and shiny, beautiful and not easy to rust. The small size allows you to take it everywhere and can fit in many tool bags. This keychain extension is suitable for converting drill bits, screwdrivers, bits, etc. [Safety use]: The keychain extension rod is small in size and easy to carry. Smooth surface treatment and bushing extraction can avoid accidental dropping of tools and facilitate aerial work. The powerful ball lock can carry tools weighing up to 500g. [Easy to install and with buckle] The large diameter flat ring is easy to install on the chain buckle. Equipped with a chain loop, which can be hung on the belt. You can also use the keychain with your favorite iron padlock as needed.[Application] The set includes 6 x 1/4 hex handle keychain extension rods with black metal clasps. Universal 1/4 quick hex handle and 1/4 hex socket are suitable for most electric drives, hand drives and drill bits. Note: The data are all manual measurement, please please allow 1-3cm error, due to the light and display difference, there will be some color difference, depending on the physical object received.