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Lyman's Deluxe Carbide expander/decapping rod assembly is compatible with all Lyman and RCBS rifle sizing dies. This assembly upgrades these dies with an extra-hard carbide expander button which enables carbide neck sizing while retaining your preferred dies. The carbide's smooth surface reduces "grab" on the brass, allowing the button to pull out of the case neck more easily and prevent case stretching. This results in less frequent trimming of cases and extended case life. The free-floating button centers itself automatically in the case neck, and an adjustable positioning sleeve offers two positions for the button, facilitating a better fit for different-sized cases and allowing for more control over the button's stroke through the case neck, making it easier to get maximum leverage from the press linkage.Push comes to shove, you can replace the decapping pin.