Thanks, I thought that it seemed underbuilt. I live in a 70K person town and we don't have an electrical supply store, home depot/lowes is the best we can have and I didn't think our napa, orielly, etc would have anything.
The kit I have the 12awg is the same thickness, ironically the #10 has a lot of surface area. I did find these that appear to have more surface area but it might be worth looking at Grainger or similar. Maybe Crutchfield, car audio folk have to get them somewhere.