"STEEL; 7.000 IN.OD; 1.500 IN.ID; ONE KEYWAY 1.500 IN. WIDE LOCATED IN BORE ID; SIZE MTG HOLES 0.250 IN. DIA; 0.250-28UNF THD SIZE,0.500 IN. DEPTH V-GROOVE AROUND DAMPER; HUB EXTENDED 1.250 IN. LG ON ONE END W/2.000 IN. OD; THREE ELONGATED SLOTS 2.375 IN.LG,0.500 IN. WIDE"