6pc professional impact socket adaptor (converter) tool set, set includes reducer from female square drive to male square drive as follow - 1/4" (F) x 3/8" (M) , 3/8" (F) x 1/4" (M) , 3/8" (F) x 1/2" (M) , 1/2" (F) x 3/8" (M) , 1/2" (F) x 3/4" (M) , 3/4" (F) x 1/2" (M) Made of hardened and tempered Chrome Molybdenum (Cr-Mo) steel with manganese phosphate finish for extra corrosion resistance. Each feature retaining groove and hole for extra grip and maximum safety (pin and safety ring can be purchased separately) Each impact socket adaptor/reducer also available separately. Supplied in handy storage case.
Set includes:

- 1/4" female x 3/8" male (27mm long)
- 3/8" female x 1/4" male (27mm long)
- 3/8" female x 1/2" male (34mm long)
- 1/2" female x 3/8" male (39mm long)
- 1/2" female x 3/4" male (46mm long)
- 3/4" female x 1/2" male (54mm long)