This is a ring connector with a 6.4mm hole which fits battery terminal screws on motorcycles. Fits 3-5mm wire which is roughly 8-10 AWG.
Made of 1mm thick sold brass this is a stout mutha....
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NOTE: If you need me to make you up a custom red or black stout battery wire shoot me an email and let me know length and what terminals are needed at each end etc. I have the right crimping tools and can make it look factory for you.