as soon as I got to looking at them, I noticed the copper plated contacts were way too thin. the bolts were too short for putting any REAL connector on. had to find stuff that would work, and basically had to redo all the important stuff I bought these for. I could have saved a LOT of money by just buying a cheap set of jumper cable clamps. I dont believe for a minute that these can handle 8-900 amps for any length of time. I should have just torn apart an old set of jumpers for free.