The Neck/Shoulder Sizing Bushings are designed for Short Action Customs' Modular Sizing Dies, specifically for the 6mm Creedmoor cartridge, with a .269" diameter.
These bushings aim to improve cartridge concentricity and reduce neck runout with their new internal geometry.
Made of 17-4 H900 stainless steel, they undergo the same heat treatment as Precision Resizing Dies for a smooth and slick finish.