Models 151-156 feature a quick-acting design, I-beam construction, hardened wear surfaces and thrust bearing slide assemblies for smooth operation. 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! Available in models for plastic pipe or metallic tubing. Models 151 and 152 feature fold-away reamers. Model 151-ML is suitable for cutting multilayer tubing.