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QUESTION: What diameter lugs do common EV devices use? ANSWER: Here are the diameter of lugs that several of the devices we sell use: Albright contactors: 3/8" Zilla: 5/16" with 1/4" bolts ImPulse 9: 3/8" WarP 9: 3/8" WarP 11: 5/16" TransWarP 11: 5/16" Ferraz/Shawmut Fuses: 3/8"