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Heavy Duty SPST Relays, 12 Volt 100 amp 4-prong, 9.6mm Copper Pin. Made of AgSno2 contact material, Copper Coil, Copper Pin, it has better conductivity, better resistance to arc erosion High quality composite housings protect against harsh temperatures, Mechanical life of 1,000,000+ cycles 100A coil capacity- able to handle those high current applications with ease and easy to install. Ideal for auto alarm Monteure, Audio Plumbers, Electricians, DIY use etc.