21st Century Shooting is excited to unveil a brand new product! Introducing the Slippery black Arbors, this new product will revolutionize the way you reload. Based on our proven technology these arbors will reduce friction and galling-they are as hard as carbide and as slick as graphite.​ Can be used as an expander mandrel for setting neck tension.  We recommend our Moly Dry Neck Lube for use with our expander mandrels Moly Dry Neck Lube (21stcenturyinnovation.com)

These are sized .002"  (+/-  .0002")  below bullet diameter.