Sinclair Carbide Neck Expander Mandrels are made from solid carbide for improved tolerances and lubricity, and are resistant to galling.
The mandrels are designed .001" smaller than bullet diameter for optimal neck tension and concentricity in neck turning and bullet seating.
These mandrels are compatible with the Sinclair Expander Die and Neck Turning Tools, specifically for 270 Caliber, 6.8mm with a diameter of 0.276 inches.