The RCBS Lube-A-Matic Bullet Sizing Die is sold in different diameters, including .22, .26, .244, .312, .321, .354, .355, .356, .357, .376, .400, .401, .417, .427, 429, .430, .431, .450, .451, .452, .454, .457, .458, and .500. For lubricating bullets more easily, even with hard lubricants, this die is perfect. The die boasts a hardened interior, promising excellent alignment for cylindrical shapes.For people who prefer reloading, the interior coordinates with most handgun and rifle calibers and fits the Lube-A-Matic two-bullet sizer/lubricator or the Lyman 450/4500 lube sizer. The die also crimps the gas check on those style bullets.