Comparison : Item # 618/4, 61800 Series Deep Groove Radial Ball Bearings
Item # 618/5, 61800 Series Deep Groove Radial Ball Bearings
Item # 618/6, 61800 Series Deep Groove Radial Ball Bearings
Item # 618/7, 61800 Series Deep Groove Radial Ball Bearings
Item # 618/8, 61800 Series Deep Groove Radial Ball Bearings