0.281" hole diameter is reletive to shape of item being an oblique triangle with a bearing surface of 0.880 in. expanded in five places around its perimeter with a radius of 0.500 in around each bolt hole triangle
0.323" hole diameter 6.110" outside diameter 8 bolt hole quantity one 4.312 in. dia. packing preformed moulded into groove on each side of gage ring circular