Redding 73 style steel bushings are heat treated and have hand-polished sizing diameters with a surface hardness of Rc 60-62 for reduced sizing effort.
Bushings are available in a range from .185" through .368" in .001" increments, with the part number (#RD73XXX) indicating the size.
The specific product has a diameter of .242 inches and falls within the size range of .185" to .250".