Comprehensive set of impact adaptors for use on all types of impact tools. Manufactured from drop-forged Chrome Vanadium steel with phosphate finish for added corrosion protection. Contents: 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), 3/4" (F) x 1" (M), 1" (F) x 3/4" (M). Supplied in storage case. Model No. AK5900B