Review on Power Up Your Vehicle With InstallGear'S Power Distribution Block - 0/2/4 AWG Gauge & 1/0 Gauge In To (2) 4/8 Gauge Out, Perfect For Auto, RV, Motorcycle And Boat by Johnny Santana

I am connecting one input and 3 outputs of 12 gauged copper stranded wire. At first the hold inside where the screw makes contact was not tight enough. I finally had to cut more insulation off the end of the wire and double it over for a larger diameter. Then, it fit tight and made a strong hold. The stranding was split in half during the tightening and would pull out easy. I believe solid coper wiring would be a perfect fit for those small set screws.