Redding 73 style steel bushings are heat treated, with hand-polished sizing diameters and a surface hardness of Rc 60-62.
Bushings are available in a range from .185" through .368" in .001" increments, with the specific size indicated by the last three digits of the part number.
The product features a .329" diameter, fitting within the comprehensive range of neck size bushings offered by Redding for precision reloading.