RCBS®COATED NECK BUSHING•Diameter: .288"•Material: Tungsten Disulfide WS2 coated steel•Self-centering changeable neck bushing lets you precisely set the amount of tension on the bullet when using RCBS® Gold Medal Match Series reloading dies •Reduces work hardening of the case neck brass prolonging case life & increasing accuracy •NOTE: RCBS suggests that you have neck bushings one to two sizes above & below their target diameter
