Electricians and DIYers, this 100-pack of yellow WingGard wire connectors from Gardner Bender is a workhorse you'll want in your toolbox. These aren't your basic wire nuts – they have wings! Those wings give you way more grip and leverage, making it super easy to twist them on tight, even on tough splices. Inside, there's a zinc-plated square-wire spring that instantly adjusts to the wires for a secure, corrosion-resistant connection. They're rated for 600V in building wiring and up to 1000V in lighting fixtures. The flame-retardant shell can handle heat up to 221°F. The deep skirt design helps prevent any bare wire from being exposed for safety. They're for copper-to-copper connections only. The wire range is #22 AWG (small) up to #10 AWG (big). Specifically, the minimum is 2 x #18 wires and the maximum is 3 x #12 wires. UL listed for peace of mind. A great value bulk pack for any wiring project around the house or job site.