I bought this socket set to use with new wheels which came with small tuning nuts and relatively small mounting holes. The thick socket either doesn't fit the lug holes in these wheels or is so tight that it could damage the paint or other surfaces on the wheels. I tried using plain packing tape on a regular outlet, but the tape wasn't strong enough to take even one turn of the tire. I was a little concerned that the metric sizes in this socket set would not fit my standard sized nuts, but the 19mm socket is identical to the 3/4" socket that I am replacing. I'm not sure what material the plastic case is made of, but it seems strong and smooth.