Redding's Titanium Nitride Neck Bushings are heat treated steel bushings with a Titanium Nitride coating to increase hardness and reduce friction.
These bushings are available in a range from .185" to .368" in .001" increments, with the part number ending in the size (e.g., #RD76XXX for a .311" bushing).
The specific bushing size for this product is .311" in diameter, suitable for precision reloading applications.