17" dia., 4mm (.157) thick, 1-11/32" x 31/32" pilot hole. 6 hole pattern for 3-1/4" bolt circle. For International Harvester Super Chief moldboard plows.
20" dia., 4.5mm (.177) thick, 1-11/32" x 31/32" pilot hole. 6 hole pattern for 3-1/4" bolt circle. For International Harvester Super Chief moldboard plows.