HIGH QUALITY: Each outlet adapter is made from heat treated vanadium steel with a black oxide coating. Tripod torque compression and superior strength to meet standard operating conditions, high quality chrome-molybdenum steel and manganese phosphate coating to prevent rust and corrosion and durable. VERSATILITY: The 1/4" hex shank fits all quick-change drill chucks. Its perfect size makes it compatible with all brands of drill bits and screwdrivers. Works with all types of ratchets, ratchets, sockets, torque wrenches, hold handles. Unique: Special impact design developed for screwdrivers and wrenches, each square head is fitted with a spring-loaded ball bearing and locked in socket to prevent slipping during use. GREAT FOR TOOLS: Versatility and convenience no matter what tool you use.Great for DIY, home maintenance and most general repairs, but not for industrial work.A great addition to any toolbox.