The model 30 Screw Feed Tubing Cutter features an X-CEL Knob for easier, quicker cutting and a convenient fold-away reamer. The Screw Feed Tubing Cutters make clean, square cuts on copper, brass, thin-wall steel, and aluminum. The 30S model features a heavy duty wheel for cutting. It has a 1”- 3 1/8” tubing capacity.