10pcs V624ZZ V <span class="ui-risk_flag4"><span class="ui-risk_flag4"><span class="ui-risk_flag4">Groove</span></span></span> Ball Bearing Pulley For Rail Track Linear Motion System 4*13*6mm Features: These bearings are made from carbon steel for durability and long service life. They are double shielded to avoid contaminants entering and save lubricant. Bearings have 1.5mm deep V groove that generally ride on a rail or track. These are professional bearings that are used in many linear motion systems. There comes total 10 pcs bearings which you may use for many different projects. Specifications: Material: Carbon steel Model: V624ZZ Inner Diameter: 4mm / 0.15" Outer Diameter: 13mm / 0.51" Thickness: 6mm / 0.23" V groove Width: 5mm / 0.19" V groove Depth: 1.5mm / 0.06" Quantity: 10pcs Package Includes: 10 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.