19 piece set features a ratchet with an indestructible protective coating, a CRV steel core and 72 gear teeth. Black double plated sockets are laser etched for easy reading SAE sizes: 5/16", 3/8", 7/16", ½", 9/16", 5/8", 11/16", ¾" and 13/16"Metric sizes: 9, 10, 11, 12, 13, 14, 15, 17 and 19mm