Tin Plated Aluminum Dual Rated Mechanical Lug , #4 - 600 kcmil, or Two 250 kcmil to 1/0. CSA/UL Listed. Copper and Aluminum Temperature Rating of 90 Degrees C, Bolt 1/2 Inch. Length 3-3/4 inch, Width 1-3/8 inch, Height 1-13/16 inch. Pad Thickness 5/16 inch with Inline - One 13/32 inch Diameter Hole and One 5/8 inch long x 12/32 inch Slot on 1-1/4 inch Center. Tapped 15/16-16 UNF-2B x 1.4 inch Deep. Includes Tin Plated Aluminum Hex Head Set Screw 15/16-16 x 1-1/4 inch long.