"DIMENSIONS-2.750 IN. DIA.,1.165 IN. HT.,1.920 IN. HUB HT.,0.500 IN. HUB DIA.-HOLE 0.2498 PLUS 0.0005 MINUS0.0000 IN. CSK 90 DEGREES BY 0.312 THRU BOTH ENDS OF HUB;CHAMPHER 45 DEGREES BY 0.020 IN. AT 4 PLACES;HOLES 0.187 IN. FROM EACH END OF HUB THRU ONE WALL ONLY NO. 6-32;MATERIAL-BRASS 1/2 H QQ-B-626"