SPECIFICATIONS Our 3-Piece Impact Grade Socket Adapter/Extension Bit Set comes with three 1/4 in. hex shank, 3-in. long socket adapters so you can adapt any of your impact drill to a power socket driver. The sizes included are 1/4 in., 3/8 in. and 1/2 in. and are compatible with 1/4, 3/8 and 1/2-in. sockets respectively. 【DESIGNED FOR THE TOUGHEST JOBS】Constructed out of heat-treated chrome vanadium steel and ultimately coated in Manganese Phosphate for industrial or mechanical use, the adapters meet or even exceed the ANSI/ASME standards. They are rust-proof and corrosion-resistant. 【IMPACT GRADE】All adapters features a spring loaded detent bearing ball that locks onto sockets to ensure a secure fit into the driver head to prevent slipping and loosening. It also allows you to perform auto repair tasks easily. These impact-grade corrosion-resistant adapters are perfect for increased torque jobs, helping to prevent the breaking and stripping of sockets. 【VARIETY OF USES】Useful for Automotive Mechanic Vehicle Repairs, Technicians, Handyman and Hobbyist Developments to use with sockets on Hardware/Tire Nuts, Lag Bolts, Hex Head Cap Screws at Home, Workshop Factory or Construction Site. Provides the utmost versatility and convenience no matter which tool you are using.