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