Morris Products 93060 Compression Lug, 1 Hole, Aluminum, 4/0 Str. Wire Range, 3/8" Stud Size Aluminum Long Barrel 1 Hole Compression Lugs - A One Hole Compression Lug for use with Copper or Aluminum Cables One Hole Aluminum Compression Lugs are AL9CU Dual Rated and accept both Aluminum and Copper Conductors Connector Barrel is Coated with Oxide Inhibitor & capped Aluminum Compression Lug is made of High-Conductivity Seamless Aluminum Uniform Bright Electro-Tin Plating resists corrosion, reduces contact resistance and gives you maximum conductivity