7steel, corrosion resisting, qq-s-763, comp 410 or steel, corrosion resisting, qq-s-766, comp 302 half hard or 304 or 410; rockwell c hardness rating 40 and 43; 1.365 in. Outside diameter; 1.215 in. Min and 1.240 in. Max inside diameter and 0.220 in. Thk