ILSCO Panelboard Lug, Mechanical connection, Dual Rated, Aluminum material, Tin plated connector,2 mounting hole(s), mounting bolt/stud size 1/2 in, mounting hole spacing 1.75 in., UL 486A/B Listed, C22.2 No. 65-03, Copper/Aluminum Primary Conductor 600 kcmil - 2 Str, 3 conductors, 3 ports/wireways, Drive Type Main 1/2 Internal Hex, rated for 35 kV, primary color Silver, 1 poles,