SKF single row deep groove ball bearings.
61800 61800ZZ 618002RS (6800 6800ZZ 68002RS) - 10x19x5mm
61801 61801ZZ 618012RS (6801 6801ZZ 68012RS) - 12x21x5mm
61802 61802ZZ 618022RS (6802 6802ZZ 68022RS) - 15x24x5mm
61803 61803ZZ 618032RS (6803 6803ZZ 68032RS) - 17x26x5mm
61804 61804ZZ 618042RS (6804 6804ZZ 68042RS) - 20x32x7mm
61805 61805ZZ 618052RS (6805 6805ZZ 68052RS) - 25x37x7mm
61806 61806ZZ 618062RS (6806 6806ZZ 68062RS) - 30x42x7mm
61807 61807ZZ 618072RS (6807 6807ZZ 68072RS) - 35x47x7mm
61808 61808ZZ 618082RS (6808 6808ZZ 68082RS) - 40x52x7mm