[Application]: The V groove bearing is widely used in industrial machinery, cars, ships, household appliances, health systems, motors, mining, petroleum, alchemy, papermaking, agriculture, cranes and other fields. [High Quality]: These bearings are made of high quality carbon steel for long service life, with smooth polishing, high efficiency and low noise [Usage] The bearing has uniform hardness and wear resistance, high temperature resistance and double shielding to prevent the ingress of contaminants except the lubricant [Size]: The bearings have a 1.5mm deep V groove that typically mounts to a track or track [Package Includes]: These are specialty bearings used in many linear motion systems, such as a 3D printer, quadcopter or ship model, Packed with 10 units, you can keep them as spare parts or just replace the old ones. Note: The data are all measured manually, please allow 1-3cm error due to differences in light and display, there may be some color differences, please refer to the actual item received.