Copper Mechanical Lug, 1 Hole, 2 Barrel, Offset Tongue, No. 1 American Wire Gauge (AWG) - 250 kcmil, 3/8 Inch (9.5 mm) Stud, Dual barrel provides termination of two copper conductors, Made from high strength electrolytic copper to provide premium electrical and mechanical performance, Internal pressure bar and V-bottom collar provide uniform clamping force on conductor to assure positive contact between conductor and connector, Inspection window to visually assure full conductor insertion, Plated steel set screw provides high strength, durable electrical contact between conductor and connector, UL Listed and CSA Certified for use up to 600 Volts.