The Inox Italian adjustable pipe reamer works on exactly the same principle as the Dunhill pipe reamer but is a fraction of the price. It is made from the best quality Inox stainless steel and feels very robust yet is still unobtrusive to the pocket. Assuming you don’t loose this pipe reamer it should outlast you!
To adjust the reamer for the bore your pipe simply loosen the bolt and pull the blades. If you want the reamer set at the exact width for every ream then a small spanner will ensure the reamer stays on the same setting permanently.