C=(C-SKF)=15° Contact Angle. TR=Outer Ring Guided Phenolic Cage. DUM=(DM-Ax. Int. Cl/Pr Segment)/(DGB-SKF)=Set Of 2 Universal Bearings, Medium Preload. P4=Dimensional & Running Accuracy To ISO Tolerance Class 4 (More Accurate Than P5)-Abec.7