[Heavy-Duty Material] These drill bit holders are made of high-quality aluminum alloy, strong, , , sturdy, and can be used for a long time. [Strong Load Capacity] The drill bit extension bar is made of high-quality materials and refined workmanship to a strong bearing capacity, strong enough to withstand the bit without slipping or breaking. [Wide Compatibility] The drill bit keychains are suitable for most 1/4 inch hex handles, 1/4 inch hex sockets and various electric screwdrivers, hand-held screwdrivers, drill bits, and so on. [Quick Change] The cupped design of the hex shank keychain is easy to hold and convenient to replace another drill bit, their smooth finish and removable bushings can avoid hex shank keychain extension bars from falling., Weight: 0.29321480846 pounds, Manufacturer: Tuidzljd