RCBS 5-Station Shell Plates properly align the case with the reloading die during reloading. They're built from hardened steel and capture 0.125-inch of the case head for proper SAAMI headspacing. They feature five stations and are for use on PiggyBack PiggyBack 2 PiggyBack 3 PiggyBack 4 AmmoMaster Auto Pro 2000 and Pro 2000 Auto progressive presses