These heads are specially designed to fit the Tru-Hot Grooving Iron, Ideal Grooving Iron, and Econ-o-siper, Has an overall diameter of .38" and is available in several sizes to custom fit your need, Solid brass construction, Blades can be installed into head for grooving or siping tires, Five most common sizes available: #3, #4, #5, #6, and #8.
