Item Type: Ball Bearing Weight: Approx.223g / 7.9oz Material: Chrome Steel Inner Diameter: Approx.20mm / 0.8in Outer Diameter: Approx.52mm / 2.0in Thickness: Approx.22mm / 0.9in 1Manufacturing Material: Made of high quality chrome steel material, long service life, slippy, no edges, and low noise during operation. 2Good Sealing: Both sides of the double row angular contact ball bearings are designed with seals to keep the lubricating oil in a sealed state. 3High Performance: Uniform hardness, wear resistance, high temperature resistance and double shielding to avoid contamination. 4Wide Application: Mainly used in textile machinery, printing machinery, automobile industry, household appliances, currency detector. 5Easy to Use: Easy to use and fine workmanship. Without any difficult requirements even though you use it for the first time.1 x Bearing