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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