... CA: Integral brass cage, double row symmetrical rollers,inner ring rideMA: Integral brass cage, double row symmetrical rollers ,outer ... : Two piece steel cage, double row symmetrical rollers,inner ring rideCTN1: Double row symmetrical rollers ,nylon cageK: Tapered bore ... bore bearing,the taper is 1:30W33: With lubrication groove in outer ring,with three oil holesC2/C3/C4: Internal clearance series ...