RCBS Lube-A-Matic Lube and Sizer Dies are a great and easy way to lubricate bullets even with today's hard lubricants. RCBS sizing dies feature hardened interior insuring alignment for perfect cylindrical shape. Interior dimensions correspond to suggested diameters for all popular rifle and handgun calibers. Fits RCBS Lube-A-Matic-2 Bullet Sizer/Lubricator and the Lyman 450/4500 Lube Sizer. Sizer dies also help to crimp the gas check on the base of gas check style bullets. Top Punches sold separately.