RIDGID's Screw Feed Tubing Cutters make clean square cuts on copper, brass, aluminum and thin-wall steel. X-CEL® Knob cuts tubing more quickly and easily with a larger, more ergonomic designs. The RIDGID Model 20 Screw Feed Tubing Cutter is designed to make clean and smooth cuts on 5/8 (15.87 mm) to 2-1/8" (3.175 mm)-inch diameter stainless steel.