... :2,Structure:General,flanged,extended inner ring3,Shield / closure: Open,Teflon Sealed,Rubber Seals,2 Metal Shield4,Tolerance codes: ABEC-1, ABEC ... ,Bore Size:from 1mm to 15mm10,Outside Diameter:from 3mm to 50mmTYPE Size Designation Metric Open Bore Size:from 3mm to 15mm MR,67 ... Shielded Bore Size:from 3mm to 15mm MR,67,68,69series Inch Open Bore sizes 0.0781 to 0.375 inches R series ...