Quickly and easily change impact drive sizes with the TEKTON 3-Piece Impact Adapter Set. Constructed from drop forged, heat treated carbon steel with a corrosion-resistant black oxide finish. They lock onto sockets and driver tang for secure use. The adapters are backed by a lifetime replacement guarantee. Set Includes- (1) 1/4-Inch (F) by 3/8-Inch (M), (1) 3/8-Inch (F) by 1/2-Inch (M), (1) 1/2-Inch (F) by 3/4-Inch (M).