Grips the shell for a firm fit in the press during reloading or priming operations. Will fit the Auto Prime and Auto Prime II. Size #5 Type Shell Holder Finish Silver Series AP Only Weight 0.04 lbs Caliber 223WSSM/257 Wthby/6.5 Rem Mag/338 Function Holds Cases Includes Shell Holder Material Steel Quantity 1 Media Type Brass Shell Compatible With Auto Prime/Auto Prime II