[High -quality materials] Our rolling balls are made of High-quality materials, which are strong and durable, smooth and wear -resistant, high efficiency, and strong carrying capacity. Help you extend industrial life. [Wide application range] The universal rotating balls can be widely used in transportation line installation, processing systems, wooden boxes, transmission furniture, workbench, , transmission systems, etc. They run stably in environments and are suitable for different types of surfaces. [Easy to use] The rotating ball foot wheel has standard size and design, which is convenient for installation and replacement. There are two installation holes at the bottom of the bottom, which is easy to install in the horizontal direction, which makes it easy for items to flip, and has the characteristics of logistics handling and rotation direction. Load capacity: 400 pounds Material: Metal colour: Silver Package Contents: 40 x roller ball Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.