Review on Install Bay YVRT14 4 Inch Terminal by Billy Berry

Good quality metal ring and plastic insulation. The metal looks like tinned copper (copper colored when you scrape off the top layer). The plastic insulation is flexible enough that the plastic doesn't crack or chip when crimping the connector onto 12 gauge wire (unlike some crimp connectors I have). Perfect for 1/4-20 bolts, as expected for 1/4" ring terminal.