The NSI Industries ET-CP-12 Easy-Twist Wire Connectors Combo Pail, 180 Count includes a combination of the most common Easy-Twist Connectors. The Standard Easy-Twist Connectors have a fixed, precise square wire spring providing secure gripping of conductors. Deep Skirt entry provides protection from flashover and shorts. Compact design ensures proper installation-especially in tight spaces. The Winged Easy-Twist Connectors offer deep surface ridges and swept-back wing which provides better grip and increased torquing ability. Square wire spring provides secure gripping of conductors. Flame retardant thermoplastic shell provides excellent electrical insulation.