0.688" hole diameter 21.625" outside diameter 16 bolt hole quantity 2 passes located on top half of id separated by 1 0.375 in. wide rib, one full pass on bottom half separated from the top by a 0.375 in. wide rib circular
23.500" outside diameter 0.275 inch wide rib extended across the inside dia, 0.275 inch wide rib located 90 degrees from the center line, extended the length of the radius of the id