Inner Ring Bore Diameter 3 3/4 in Outside Diameter 4.248 in Overall Width 2.01 in Ring Material Alloy Steel System of Measurement Inch Bore Diameter Tolerance +0.0000/-0.0008 in Finish Chrome Plated Lubrication Openings Oil Holes Outside Diameter Tolerance +0.0000/-0.0009 in Ring Material Grade 52100 Standards as 9100 ISO Certified 9001 Mil-B-3990 (SAE as 39901)