The product is designed to operate with 14-18 AWG wire. No problem with 18 AWG, but it actually cuts through my 16 AWG wire. The return process has already started.
Pros
These Wire Terminals are made of high quality insulated and flame retardant material, including durable PVC body, high purity tin plated copper for corrosion resistance, and protective cover, which can ensure your safety when using electricity, reliable connection and good insulation.