Neiko 30249A Impact Adapter and Reducer Set, Chrome Vanadium Steel | 5-Piece Set for Impact Driver Conversions Specific impact grade design made exclusively for drivers and wrenches Constructed of heavy duty drop forged, heat treated chrome vanadium steel for superior strength to endure all conditions Highly durable black oxide coating finish is corrosion resistant to eliminate chance of rust for a long lasting tool life Spring loaded detent balls keeps your sockets secure with through holes that allows the use of locking pins and rings Universal 5 Piece set includes 2 reducers: 3/8" Female x 1/4" Male, 1/2 inch F x 3/8" M and 3 adaptors: 1/4" F x 3/8" M, 3/8" F x 1/2" M, 1/2" F x 3/4" M