I have a "Pipe Service Kit" that has all the tools needed. If I were to get just the reamer, I would go for a good adjustable. The one I have has knob to turn to expand the actual reamer to fit the bowl. Works on any size bowl for diameter and depth. The "pocket reamers" aren't made for any size and are not very user friendly. With the kit you get a "knife" that is used for really bad cake. Use the knife to make enough room for the reamer.