Enlarge the finger size of your wax models quickly and accurately. Hardwood mandrel is specially machined to incorporate a cutting steel blade that extends from the handle to the tip on the tapered section. Slide this tool through the hole of wax ring or ring tube and gently rotate clockwise. As the blade turns it scrapes inner wall, enlarging the ring to the size that is marked along the mandrel, leaving a smooth and even finish on the ring.