"STEEL MIL-S-8844 CLASS 1 NO. 4340,CHROME PLATE FINISH,4.937 IN. O/ALG,2.683 IN. MIN TO 2.685 IN. MAX DIA,AS NOTED MACHINED SURFACES 4 16 63AND 125 MICROINCH FINSIH,HEAT TREAT 260000 TO 280000 PSI,SHOT PEEN ALLAREAS,1 HOLE THRU 2.045 IN. MIN TO 2.050 IN. MAX DIA,BORE 2.250 IN. DIA1.390 IN. DEEP"