Special applications: Universal. Insulated/Grounded: Grounded. NO/NC: Normally Open. Housing: Plated Steel. Terminals: Copper; 10-32 thread and 5/16""-24 thread. Hex nuts and lock washers included. Duty Cycle: Continuous. Bracket: Curved. Bracket mounting holes 5/16" x 19/32" 2 13/64" on center (7.9 x 15.1, 56.0mm). Breather hole: None.