Aluminum Grounding Clamp, Dual Rated, No. 6 American Wire Gauge (AWG)-250 kcmil, For Conduit, Pipe or Water Tube Size 1 1/4 - 1, 1/2 - 2, Dual-rated for grounding aluminum or copper code conductors to copper water pipe, galvanized pipe, or steel conduit, Made from high strength, extruded aluminum alloy to provide long term durability, Tin-plated to inhibit corrosion and oxidation and for low contact resistance, Plated steel screws provide high strength and inhibit corrosion, Accommodates a wide range of pipe, tube, and conductor sizes - minimizes inventory requirements, UL Listed for grounding and bonding.