9 Piece 1/4inch drive hex bit socket set, covering a range from 3-12mm hex bits. Chrome vanadium. S2 steel bits pressed into the socket. Satin finish for a better grip when handling the socket. Designed for use with fastenings with a hexagon hole. Use with in-hex screws or grub screws. Design and manufactured to DIN 7422. Supplied with a clip rail with socket clips for easy storage as a set.