HIGH QUALITY: Each socket adapter is made of carbon steel with a black oxide coating. Tripod torque compression and superior strength to meet standard operating conditions, premium chrome molybdenum steel with manganese phosphate coating to prevent rust and corrosion and provide long-lasting durability. VERSATILITY: 1/4" hex shank fits all quick change drill chucks. Perfect size makes it compatible with all brands of drill bits and screwdrivers. Works with all types of ratchets, ratchets, sockets , torque wrenches, waiting handles. Unique: A special impact-type design developed specifically for screwdrivers and wrenches, each square head is equipped with a spring-loaded ball bearing and Locks in socket to prevent slipping during use. Great for tools: Offers versatility and convenience no matter what tool you use. Great for DIY, maintenance. home and most general repairs, but not suitable for industrial work. A great addition to any toolbox. Note: The data is all measured manually, please allow 1-3cm error Due to differences in light and display, there may be some deviations. color differences, please refer to the actual item received.