3M Secure Grip Wire Connectors are designed to give you dependable performance for a wide range of residential and commercial wiring jobs. An internal, insulated spring delivers a powerful grip for secure, solid connections that are made to last. The slip resistant ridges and straight wing design make installation fast, simple and easy on fingers.3M Secure Grip Wire Connectors are available in a variety of colors/wire ranges: SG Y (yellow) 2 #18 3 #12; SG T (tan) 3 #18 3 #10; SG G (green grounding) 3 #14 3 #10 (solid only); SG R (red) 3 #14 2 #8; SG B (blue) 6 #14 2 #6. UL Listed.