0.2500" first hole diameter 3.2200" overall length outside right corner relieved to 0.860 in. dia, 0.180 in. long; external groove located 1.245 in. from outside left corner, 0.400 in. wide, 0.750 in. dia, double champhered left corner 0.038 in. long by 20.0 deg angle first oil surface treated 17c solid, plain, no outside flanges