"CAST IRON;FOUNDRY BRINNEL HARDNESS 149 TO 167;2.997 IN. MIN 3.000 IN. MAX OD;2.266 IN. O/A LG;1.379 IN. MIN 1.381 IN. MAX BORE DIA;ONE KEYWAY 5/16 IN. BY 9/64 IN.;FOUR HOLES 0.313 IN. REAM DIA;ONE HOLE 5/32 DRILL THRU BORE,CENTRALLY LOCATED ON CENTER LINE;END CHAMFER,1/32 BY 45 DEG;FOR C6-1/2 AND 7-1/2 CLUTCHES"