The Draper 63537 sockets are manufactured from chrome vanadium steel, which is correctly hardened and tempered to ensure a durable, hard wearing product. Each socket has a knurled ring for extra grip, more→and this set is also supplied with a 72 tooth reversible soft grip ratchet and accessories. This set includes: 1/4" sockets; 4, 4.5, 5, 5.5, 6, 7, 8, 9, 10, 11, 12, 13mm, 1/4" deep sockets; 4, 4.5, 5, 5.5, 6, 7, 8, 9, 10, 11, 12, 13mm, 1/4" extension bars; 50, 100, 150mm, 1/4" sliding T bar 1/4" coupler 1/4" (F) - 3/8" (M) adaptor Spinner Handle 3/8" sockets; 10, 11, 12, 13, 14, 15, 16, 17, 18, 19mm 3/8" deep sockets; 10, 11, 12, 13, 14, 15, 16, 17, 18, 19mm 3/8" extension bars; 75,