Feature 1These bearings are made from high quality carbon steel for durability and long service life 2They are double shielded to avoid contaminants entering and save lubricant 3Bearings have 1.4mm deep V groove that generally ride on a rail or track 4These are dedicated bearings that are used in many linear motion systems 5There comes total 20 pieces bearings which you may use for many different projectsFeatures: These bearings are made from high quality carbon steel for durability and long service life. They are double shielded to avoid contaminants entering and save lubricant. Bearings have 1.4mm deep V groove that generally ride on a rail or track. These are dedicated bearings that are used in many linear motion systems. There comes total 20 pieces bearings which you may use for many different projects. Specifications: Material: Carbon steel Model: V623ZZ Inner Diameter: 3mm / 0.12" Outer Diameter: 12mm / 0.47" Height: 4mm / 0.15" V Groove Angle: 90 V Groove Width: 2.8mm / 0.11" V Groove Depth: 1.4mm / 0.05" Quantity: 20pcs Package Includes: 20 x Bearings Note:Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering. .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }