Hornady's Custom-Grade Dies provide a lifetime of reloading. They're so well-crafted that they're guaranteed never to break or wear out from normal use and now they're better than ever! The new Zip Spindle design features a series of light threads cut on the spindle and spindle collet. This design eliminates spindle slippage and takes the knuckle-busting out of tightening the spindle lock while making spindle adjustments a snap. Hornady's new Zip spindle is nothing short of genius!