T=Machined Laminated Phenolic Cage (Single Row Radial or A. C. Bearings). 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)-ABE