Features: <br> These bearings are made from high quality carbon steel for durability and long service life. <br> They are double shielded to avoid contaminants entering and save lubricant. <br> Bearings have 1.5mm deep V groove that generally ride on a rail or track. <br> These are professional bearings that are used in many linear motion systems. <br> There comes total 10 pcs bearings which you may use for many different projects. <br> <br> <br> Specifications: <br> Material: Carbon steel <br> Model: V624ZZ <br> <br> Inner Diameter: 4mm / 0.15" <br> Outer Diameter: 13mm / 0.51" <br> Thickness: 6mm / 0.23" <br> <br> V groove Width: 5mm / 0.19" <br> <br> V groove Depth: 1.5mm / 0.06" <br> <br> Quantity: 10pcs <br> <br> <br> Package Includes: <br> 10 x Bearings <br> <br> <br> Note: <br> <br> 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.