This kit will convert any caliber Hornady New Dimension sizing die (except 17 and 20) to Hornady"s threaded spindle design. Included in the kit is a threaded spindle and a threaded spindle collet.Specifications:- Kit converts any caliber (except 17 and 20) Hornady New Dimension sizing die to Hornady"s threaded spindle design.- Kit consists of a threaded spindle and threaded spindle collet.- Remove the non-threaded spindle, collet and expander ball from the existing die, install the threaded spindle and threaded collet, re-use the existing expander ball.- If the spindle on the expander die is already threaded, then this kit is not necessary.- All die sets shipped in 2006 and later are the new threaded style.- 17 and 20 caliber use Zip Spindle Kit 550231