Riser

(1) A sub plate on which die steels are mounted. (2) A block of steel or welded construction to which punch steels or punch retainers are mounted. Also called pedestal, punch riser, or stool. (3) A plate, welded construction, or casting mounted to the bottom of the lower die shoe to facilitate scrap removal, regulate feed height, obtain shut height, etc. (4) A cast spacer between the inner ram and the draw punch in a toggle draw die. Also called punch riser.

Source: The OHIO State University