Inner Ring, Bore Diameter 1/2 in, Outside Diameter 0.749 in, Overall Width 1.01 in, Ring Material Alloy Steel, System of Measurement Inch, Bore Diameter Tolerance + 0.0000 /- 0.0004 in, Finish Chrome Plated, Lubrication Openings Oil Holes, Outside Diameter Tolerance + 0.0000 /- 0.0005 in, Ring Material Grade 52100, Standards as 9100, ISO Certified 9001, Mil-B-3990 (SAE as 39901). This item has been restricted from sale in the following state (s): []