ILSCO Box-Type Mechanical Lug, Mechanical connection, Dual Rated, Aluminum material, Tin plated connector,2 mounting hole(s), mounting bolt/stud size 1/4-20 in, UL 486A/B Recognized, C22.2 No. 65-03, Copper Primary Conductor 500 kcmil - 1/0 Str, 1 conductors, Drive Type Main 3/8 Internal Hex, rated for 35 kV, primary color Silver, 1 poles,