Hornady's Custom-Grade Dies provide a lifetime of reloading. They are so well-crafted that they are guaranteed never to break or wear out from normal use. The Sip Spindle design features a series of light threads cut on the spindle and spindle collet. This design eliminates slippage and takes the knuckle-busting out of tightening the spindle lock while making spindle adjustments a snap. Series I feature the popular bottleneck rifle cartridges. This two-die set includes a sizing die and bullet seater die.