Description: – For automotive, marine, boats, and much more applications – Heavy Duty (50 amps) push-button momentary switch that is dust and moisture resistant – 12V DC, 50A, SPST (single pole, single throw) – Contacts are pure copper for long life – Screw terminals are brass, nickel plated – Recommended mounting hole: 0.625″ (5/8″) – Maximum panel thickness: 0.500″ (1/2″) without boot; 0.312″ (5/16″) with boot – CAUTION: Disconnect negative battery cable before installation – Life: = >10000 Times Presses (Factory Tested. Minimum press test > 10000 times) .