12Pcs Drill Socket Adapter And Reducer Set, Extension Set, And 1/2" Drive ? ?HIGH QUALITY: Each socket adapter is constructed of heat treated vanadium steel and black oxide coated, and with stand torque compression and superior strength which is accordance with the standard operating conditions. ?SET INCLUDES: This impact extension and adapter set includes 4 pieces of 1/4 inch drives, 2 pieces of 3/8 inch drives, 2 pieces of 1/2 inch drives.two adapters in 1/4 (F) to 3/8-inch (M) and 3/8 (F) to 1/2-inch (M) sizes, and two reducers in 3/8 drive (F) to 1/4-inch drive (M) and 1/2 drive (F) to 3/8-inch drive (M) sizes. ?UNIQUE DESIGN?Specific impact grade design made exclusively for drivers and wrenches, spring loaded ball bearings on each square head securely and locks into sockets to avoid slippage during using. ?UNIVERSAL SIZE: 1/4 inch hex shank fits for all quick change drill chucks. Perfect size makes it compatible with all brands of power drills and screwdriver handle tools. ?WIDE APPLICATION: The socket adapter is ideal for using on automotive repairs; DIY and most of general household repairs not for industrial work. A great tool addition to any tool box set.