NSI Panelboard Lug, Dual Rated, Series: L Series, 6 AWG to 250 kcmil Conductor, 1/2 in Bolt/Stud, For Use With: Copper and Aluminum Conductors, 600 VAC Electrical Rating, 1-3/4 in Hole Spacing, 1 Port, 5/16 in Hex, 4.31 in Length, 0.88 in Width, 1.38 in Height, Aluminum, Aluminum,