I make a lot of things with PVC pipe. Pipe is hard to drill on a drill press because it likes to try and roll away. This device cradles three different size of pipe - 1/4" CPVC, 1/2" PVC, and 3/4" PVC (diameters are easily changed). It has three holes on each pipe, each marked with a vertical indicator (this lets you look at straight at the tube from the front to tell if your drill bit is centered). It has grooves for measuring, currently at 5mm (easily changed (I work with a mixture of metric and imperial units)).