Butt why: Do you spend $400 on a cool custom set of headlights, and skimp out on the wiring parts? Don't use butt connectors designed for residential use on your car! Helpful: These HD Butt connectors are straight up cool. Insert the wire. Press closed. Get on with your project. We've not seen a better butt (connector) before these. They're that solid. Sold Individually: These little guys are sold individually, so be sure to stock up. Both the double and single options are for use on 24-18 gauge 12V wiring. No amplifier installs here, but rock solid for all your accent lighting needs. DE Grease: We strongly recommend opting for the dielectric grease to ensure moisture and liquids can't contact the metal in these taps. With grease, your install is golden.