Redding's Titanium Nitride Neck Bushings are heat treated steel bushings with a Titanium Nitride coating to enhance surface hardness and reduce sizing friction.
The bushings are available in a range of sizes from .185" through .368", in .001" increments, with the specific size indicated by the last three digits of the part number.
This particular bushing has a diameter of .323 inches, suitable for various reloading needs within that size range.