RCBS Lube-A-Matic Lube and Sizer Dies make the process of lubricating and sizing cast bullets a breeze. Featuring hardened interiors, these dies insure proper aligment for perfectly cylindrical bullets. These sizer dies also help set and crimp gas checks. Fits RCBS Lube-A-Matic-2 Bullet Sizer/Lubricator and the Lyman 450/4500 Lube Sizer. Top Punches sold separately.