No-Slip design in forged cro-moly. 1″ drive sockets in a metal case. Set includes: Deep – 33mm, 1″, 1-3/16″, 1-3/4″ Thin Wall Deep – 1-1/16″, 1-1/8″, 1-1/4″ (not guaranteed) Square – 13/16″, 15/16″ Controlled Depth – 1-1/2″