Details Specs:• Rated for use with 12v ATV and UTV winches• Sealed and potted electric ATV/UTV contactor/solenoid• Relay works with most brands of winchesMX_028: For use with ATV/UTV 12v winches rated 1,500-3,000lbs, sealed and potted electric VIPER contactor/solenoids include quick connect/disconnect connectors. Treated with a moisture absorbing chemical and standard silver internals cut down on corrosion.For Use With:• Spade connections for use with Viper Midnight 3,000lb & all Viper Max 1,500-3,000lb winchesMX_228: For use with ATV/UTV 12v winches rated 1,500-5,000lbs, sealed and potted electric VIPER contactor/solenoids include quick connect/disconnect connectors. Treated with a moisture absorbing chemical and standard silver internals cut down on corrosion.For Use With:• Viper Max Winches 1,500-5,000lbs• Viper Elite Winches 3,000-6,000lbs• Viper Midnight Winches 3,000-4,500lbs• Please Note: this contactor works for both spade and bullet connectors.MX_328: For use with VIPER Max 6,000lb ATV/UTV winches, sealed and potted electric VIPER contactor/solenoids include quick connect/disconnect connectors. Treated with a moisture absorbing chemical and standard silver internals cut down on corrosion.For Use With:• Viper Max Winches 6,000lbs ONLY