Glossary A-CC-CD-EF-GG-II-MN-PP-SS-SS-TT-VW Dimensional stability ability of an alloy to retain its shape and size unchanged after aging. Draft the taper given to walls, cores and other parts of the die cavity to permit easier ejection of the casting. Ejector marks marks left on castings by ejector pins. Ejector pin a rod which forces the casting out of the die cavity and off cores. Ejector plate a plate to which ejector pins are attached and which actuates them.