Black Heavy Duty Battery Terminal Stud Firewall Feed-Through FOR 6, 12, & 36 Volt Specifications Easily connect 6, 12 and 36 volt, DC power through your firewall and bulkhead. Connector can be used wherever a battery cable goes through a firewall or other similar panel. Fits in a 1 1/4 in. diameter hole and connects with a standard 3/8 in. stud. Impact resistant plastic insulator/mounting bushing. 1-17/64" diameter 2" long. Two 3/8"-16 threaded brass stud terminals on either end each 5/8" long. Shipping weight 15 oz. More switch panels