SAE combination Non-Sparking 12-point Wrench. Precision.machined openings for a perfect fit with nuts or bolts. Oval handle for a more comfortable grip. Super drive box-end design. Bronze-Aluminium Alloy. Tools recommended for 1, 2, 21 or 22 Ex zones. The set includes: 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4", 13/16", 7/8", 15/16", 1", 1-1/16", 1-1/8", 1-1/4".