TEKTON 4960 Impact Adapter Set, 3-Piece Quickly and easily change ratchet driver sizes Drop forged, heat treated carbon steel with a corrosion-resistant black oxide finish Adapters lock onto socket and drive tang 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) Lifetime replacement guarantee