Dual rated aluminum split bolt made from heat-treated aluminum alloy for maximum conductivity and strength for copper and aluminum conductors. Triangular edges bite into the conductor to break through surface oxides which eliminates wire brushing. Electro-tin plating provides low contact resistance. Spacer bar separates dissimilar metals, prevents galvanic corrosion. Hex head provides ease of installation with standard wrenches. UL (Underwriter's Laboratories) listed, CSA (Canadian Standards Association) certified. 1 per clamshell.