Tube Master - A contour gauge for tubing and much more... We started with the basic Pipe Master concept and added a few features from other creators, then combined them with our own designs to create the most functional tool imaginable. The most important improvement is our split design using a hose clamp to hold your complex cope, so you can make the second half of your tube. The end cope reliefs let you easily locate rotation and length. We put the needles on a slight angle, so they match the O.D. of your tube.