SAE combination Non-Sparkinf 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. Opening size: 1”. Total length: 13-5/16”. Outside diameter: open end: 2”. Box end: 1-1/2”.