RCBS Tungsten Coated Neck Sizing Bushings provide precise bullet tension without needing traditional case lube, thanks to their Tungsten Disulfide coating.
They are designed for use exclusively with RCBS Gold Medal neck sizing dies and are self-centering for proper case neck alignment.
To select the correct bushing size, subtract .002"-.003" from your loaded cartridge's outside neck diameter or calculate using case neck wall thickness and bullet diameter.