These spade lugs are made of pure copper for better connection and conductivity. They are well made, designed to take heavy loads and the copper is thick and very strong. My 2/0 AWG wire fit perfectly and was crimped perfectly making a fantastic cold weld. The shrink tubing that came with it was immediately thrown in the bin. Too thin and they offer no protection. I used my own high quality heat shrink tubing for a strong and well protected connector. I find these tips to be very high quality with very cheap heat shrink tubing. They're great value for money, just use your own heat shrink tubing or order a few and forget about them. I give them 4 stars.
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