Review on 🔧 Enhanced Voilamart MC4 Crimping Tool for PV Solar Panel Installation - Compatible with 2.5mm², 4mm², and 6mm² Wire Terminal Crimping Connectors, Cable Pliers by Adam Hardy

They worked great but since they snap make sure you don't use them on anything larger than the tool can handle. I tried crimping something else with them and they didn't close completely, so the crimping tool didn't open again to pull the object out. Had to tap on the handles to close the crimping tool to open it again. They need to be repaired because they didn't break. Lesson learned. I've made about 20 crimps on MC4 connectors with them, they're easy to use and work perfectly.