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Copper Mechanical Lug, 1 Hole, Straight Floating Tongue, No. 12 No. 1 American Wire Gauge (AWG), 1/4 Inch (6.4 mm) Stud. Made from high strength electrolytic copper to provide premium electrical and mechanical performance, Internal pressure bar and Vbottom 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, cULus Listed and CSA Certified for use up to 6 Volts.