Rollers include grooves for close-to-flare cuts on models 101, 101 J and 118. Strong, lightweight slide and wheel housing, and large knurled feed screw knob give easy control of cutting pressure for clean cuts. Models 117 and 118 include a self-feeding AUTO-FEED cutter wheel that automatically cuts after tightening the knob only once. The Model 118 features a special knob for easier tightening of the feed screw. Model 101-ML is for multi layer tubing only.