Expertly crafted this is a brilliant set for any mechanic engineer or DIY enthusiast. The sockets are manufactured from chrome vanadium steel which has been heat treated and polished with a high mirror finish for extra long life and durability. The Bits are manufactured from hard wearing S2 steel. Specifications: 48mm in length. 3/8 inch drive. Highly polished. Chrome Vanadium socket. S2 Steel shafts. Sizes: T10 T15 T20 T25 T27 T30 T40 T45 T50 T55.