Aluminum Mechanical Lugs Two Conductors Dual Set Screws - Two Hole Mount 600MCM - #4- Two Hole Aluminum Mechanical Connectors provide for Flexibility in Installation.Aluminum Mechanical Lugs Two Conductors Dual Set Screws - 2 Hole Mount 600MCM - #4 features include: Dual Set Screws for Greater Resistance to Pull Out Force Dual Set Screw Two Hole Aluminum Mechanical Connector is manufactured from high strength 6061-T6 Aluminum Alloy to insure both maximum strength and conductivity AL9CU Dual Rated for both Copper and Aluminum Conductors Electro-Tin Plated to provide low contact resistance and protection against corrosion Assembly can be made with only a screwdriver or allen wrench and they are re-usable NEMA Standard Mounting Hole Drilling 1-3/4 Centers Aluminum Connector is rated 600V 194deg;F (90deg;C) UL486B/CSA Listed Dimension Measurements = Inches Order Qty of 1 = 1 Piece Below is more info on our Aluminum Mechanical Lugs Two Conductors Dual Set Screws - Two Hole Mount 600MCM - #4