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.