The Swage Support Die is compatible with the Frankford Arsenal X-10 Progressive Press along with any other reloading system utilizing inline swaging. If running multiple X-10 Tool Heads, the user can leave this die fully setup on their Tool Head making it quick and easy to make caliber swaps.Features :For Use With X-10 Progressive PressCompatible With Other Reloading Systems That Utilize Inline Swaging,Standard 7/8"x14 Threads,Black