Models 151-156 feature a quick-acting design, I-beam construction, hardened wear surfaces and thrust bearing slide assemblies for smooth operation. All Models now include an X-CEL Knob and X-CEL Pin for quicker cutting and wheel replacement. These cutters are available in models for plastic pipe or metallic tubing. Models 151 and 152 feature fold-away reamers. X-CEL Means Speed Many of our most popular tubing cutters now include several X-CEL to make your job quicker and easier. X-CEL Knob ‘ cut tubing more quickly and easily with our larger, more ergonomic designs. X-CEL Wheel Pin ‘ change your cutter wheel quickly using our new ball detent design’no tool needed’no lost clips! Spare cutter wheels included for maximum uptime.