ILSCO® ClearChoice® Panelboard Stack Lug, Type PB Dual Rated, 1/0 AWG to 750 kcmil Conductor, 1/2 in Bolt/Stud, For Use With: Aluminum or Copper Conductor, 2000 VAC Electrical Rating, 1-3/4 in Hole Spacing, 2 Port, 1/2 in Hex, 5-11/16 in Length, 1-9/16 in Width, 3 in Height, Aluminum, Electro-Plated Tin