A. The M12 threaded rod ball transfer bearing is made for performance. Utilizing sturdy ball and bearing materials, it ensures stability and durability. This product is designed and processed to ensure precision and smooth operation, making it suitable for various mechanical applications, including industrial machinery and automation equipment. B. Features C. -Color:Silver D. -Material:Steel E. -Size:5.50X3.50X3.50cm/2.16X1.38X1.38in F. -Suggested load:130kg G. -Max load:150kg H. -Constructed using ball and bearing components, this industrial ball caster offers stability and durability, making it a reliable choice for demanding applications. I. -Engineered with precision and subjected to processing, this heavy duty ball caster wheel ensures accuracy and smooth operation, meeting the requirements of modern machinery. J. -Suited for a range of machinery, including industrial and automation equipment, this rolling ball transfer provides versatile functionality and dependable performance. K. -Featuring a lightweight design, this bearing allows for straightforward installation and user-friendly maintenance, reducing downtime and enhancing operational efficiency. L. -Treated to extend its lifespan, this bearing roller feeder delivers consistent performance over time, ensuring reliability and reducing the need for frequent replacements. M. Package list: 1 x ball transmission bearing