The Redding Carbide Size Button Kit for .30 Cal allows for smoother inside neck sizing without lubrication. This upgrade kit is compatible with bottleneck cartridges ranging from .20 to .338 caliber. The carbide size button is free floating on the decap rod, which enables it to self-center in the case neck.Key FeaturesIncluded Components: Kit includes a carbide size button retainer and a spare decapping pin.