FeaturesDeep, wide throat ensures full insulation coverageThreaded entry helps guide large wire bundles right into the springLarge, finely ribbed, barrel shaped cap makes it easier to grip even when hands are greasy or dampMade of rugged, phenolic shell with thermoplastic polymer cap material and unique copper coated spring helps resist corrosionInternal round spring design multiplies the twist-on torque applied by the leverage and wedge action to firmly crush wires into a solid joint1000 VAC rated for lighting fixtures and signs(2) 14 AWG to (4) 10 AWG wire combinations