"MATL COLD ROLLED SHEET STEEL,B50 TO B60 ROCKWELL HARDNESS;HOT DIPPED ZINC COATING DULL GRAY FINISH;5.312 IN. OD;0.451 IN. H;0.0179 IN. MATL THK;PERFORATED WITH 0.154 MIN 0.156 IN. MAX DIA HOLES WITH 0.0275 IN. MIN 0.0355 IN. MAX BRIDGE BETWEEN HOLES;4 0.174 IN. DIA MOUNTING HOLES ON A 2.237 IN. DIA BC"