Cushion-grip, swept wings offer added comfort and extra leverage for less effort on large wire combinations Durable copolymer shell expands for smooth, progressive tightening that provides dependable connections Expanding square-wire spring provides secure connection every time, Quick take-up on even the toughest combinations, including solid-to-stranded Better Grip and more leverage for faster connections with less effort Product Specifications: Wire range 2 # 18 AWG to 4 #10 AWG wires, Tough UL 94V-2 flame retardant shell rated at 105 degree C (221 degree F), 600 V Rated SureGrip over-molding provides better grip for improved leverage and more torque Comfortable swept wings designed to help reduce hand fatigue