3steel 1010/1025; cadmium pltd; 40.563 inside radius; 41.031 radius centerline of holes; 48.8125 lg; 9 holes 0.4375/0.4531 diameter 8 degrees 36 min apart on arc; outside rim 1.250 h; inside rim 0.8125 h; 0.625 diameter counterbore each hole to 0.375 from plate face