Features Incorporated heavy duty silver plated contacts. One piece die-cast housing sealed with O-rings at base and mounting stem to keep out dust and moisture. Two 3/4" and two No 10-32 copper alloy stud terminals hexnuts and lock washer. Specification: Rating: Continous Rating (Make Break), Large Studs -180 Amps, Small Studs - 20 Amps, Intermittent Rating (Carrying), Large Studs - 1000 Amps (20 sec. "On" - 5 Minutes "Off") Master Disconnect Switches designed for 12 VDC vehicles (Truck, Automotive, Marine, RV) to disconnect all circuitry to reduce possibility of theft and accidental electrical fires. Available in keyed or lever versions, with or without indexing pins, and various sizes of terminal studs. Lever Operated - 6-36 Volt D.P.S.T. (Off-On) Four Stud Terminals.