Sinclair Carbide Neck Sizing Bushings are very popular among benchrest shooters because they are smoother, harder, and available in ½ thousandths increments. These bushings have a small radius on the down side only, and should not be used upside down. These carbide bushings will fit L.E. Wilson and Redding dies. Currently only available in popular 6mm sizings.
Sinclair, Issue:5B, Page:050