NOTE - THESE ARE REPLACEMENT SIZING INSERTS FOR M-SERIES DIES. DO NOT BUY THIS IF YOU DO NOT ALREADY OWN AN M-SERIES DIE, YOU WILL NOT BE ABLE TO USE THE ITEM. INCLUDED One Sizing Sleeve in the chosen caliber. These are exactly like the internal sleeves that come in the complete dies One mandrel, delivering approx .002a ^2 of neck tension in use, just like comes in the dies standard. One extra decapping pin It's a simple package that allows you to get the most of your M-Series dies.