Specifications:<br />    Type: 6001-2RS<br />    Materal:Steel， Metal<br />    Outer Diameter:28mm<br />    Inner Diameter:12mm<br />    Thickness:8mm<br /><br />Package Included:<br />    10 x Bearings<br /><br />PS:  Deep groove ball bearings.<br />       These bearings are pre-lubricated with grease.