Expert Quality, 6 point sockets manufactured from chrome vanadium steel, hardened and tempered with a micro satin finish. Each socket has a knurled ring for extra grip. Display packed. Contents: 15 x Sockets: 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22mm Manufactured and tested generally in accordance with DIN3122 and ISO3315 Specifications