Features: Designed for Making Ground Connections and Bonding Non-Metallic Sheathed Cable; Contoured Wings for Maximum Leverage; Live-Action, Square-Wire Spring Provides Superior Grounding Connections; Tough, Ul 94v-2 Flame-Retardant Shell; Ul Listed to 467 | Crimp-Free, Solderless Push-in Butt Splice. Slim Design Fits Through 1/2 In. Knockout. Faster Alternative to Traditional Butt Splices. Transparent Polycarbonate Window for Visual Inspection of Connection