[Scope of application]Universal 1/4 inch (about 0.6 cm) quick hex shank and 1/4 inch (about 0.6 cm) hex socket, convenient for placing different commonly used 1/4 inch (about 0.6 cm) drill bits. Fits most electric drivers, hand drivers and drills such as t25 and t20 drills etc. [Durable]The drill socket adapter is made of Metal, which is durable, lightweight and strong, which guarantees its service life. [How it Works]This bit holder keychain has a ball bearing to hold the bits, and they work like a slide or snap lock. This allows you to easily change the drill bit with one hand. [Large Capacity]The powerball lock of the drill holder can carry drill tools weighing up to 500 grams. The drill bit is not easy to drop. 1/4inch Hex Shank Screwdriver Bit Holder: Set includes 1/4 Hex Shank Keychain Extension Rods with Black Metal Hanging Buckles Compatible with most 1/4 Speed Hex Handles and 1/4 Hex Sockets and Assortment of electric screwdrivers, hand screwdrivers and drill bits. Portable & Wide Application: Small size, easy to carry, can be used for various drills, screwdrivers, etc. Can also be used as a keychain. / Thoughtful & Safe : The cupped design of hex shank keychain extension bars are designed for your easy holding and convenient replacing another drill bit, which can offer you a pleasant using experience. Their smooth finish and removable bushings can well avoid hex shank keychain extension bars from unexpectedly falling, ensuring the safety of high-altitude operation. Durable & Extensive Usage: These drill bit socket adapters are made of Metal, feature nice durability, lightweight, sturdy, which ensures their longevity. Hex shank keychains are suitable extension of most screwdriver bits; The universal 1/4-inch fast hex shank and 1/4-inch hex socket are compatible with a variety of electric screwdrivers, hand-held screwdrivers and drill bits. you will receive 1/4 inch hex shank keychain extension bars in some different colors, sufficient quantity to meet your