1、20PCS IN 1 SET: Including 20pcs iron sheet sealed deep groove ball bearings, which are practical and easy to replace. 2、BEARING STEEL: Made of excellent bearing steel material, it has durability and resistance to deformation under heavy loads. 3、RADIAL AND AXIAL: Deep groove ball bearings are mainly used to bear radial load, but also can bear certain axial load. 4、REASONABLE SPEED: The light load iron sealed bearing has the most reasonable speed and a wide range of applications. 5、WIDE APPLICATIONS: With standard sizes, widely used in instrumentation, household appliances and transportation equipment, etc. 20 x Ball Bearings Item Type: Iron Sealed Ball BearingMaterial: Bearing Steel Model Inner Diameter Outer Diameter Thickness 624 4mm / 0.16in 13mm / 0.51in 5mm / 0.2in 625 5mm / 0.2in 16mm / 0.63in 5mm / 0.2in 626 6mm / 0.24in 19mm / 0.75in 6mm / 0.24in 627 7mm / 0.28in 22mm / 0.87in 7mm / 0.28in 628 8mm / 0.31in 24mm / 0.94in 8mm / 0.31in