used for experimental long string instrument, to put tension on +2m piano wire. did the job just fine. had to (over)tighten the screw because of higher tension than usual (and unorthodox break angle), which put too much tension on the plastic washer inside, but once installed properly they held out without further complaints. that said, if you're using them for what they were are for, instead of the abuse i put them through, i'm sure they will also satisfy :)