4320 OR 4720 STEEL TIMKEN TUBE;3.142/3.143 IN. O.D.;0.968 IN. HIGH;HEATTREAT ROCKWELL C58-64 OR EQUIVALENT CASE HARDNESS WITH C25-45 CORE HARDNESS;3 SLOTS 0.500 IN.WD SPACED 120 DEG APART;3 HOLES 0.062 IN. DIA X 0.520 IN. DEEP EQUALLY SPACED;3 HOLES 0.055 IN. DIA X 0.110 IN. DEEP EQUALLY SPACED;SURFACE FINISH 90 ALL OVER