the package includes a total of 16 roller bearings; This generous quantity is more than enough to cater to most industrial or commercial needs; Users will not need to worry about running out of supplies in a short period the size of the ball casters is about 1 inch, the diameter of mounting hole is about 0.2 inches/ 6 mm, and the load is approximately 400 lbs; This size is ideal and versatile for various applications; It is neither too large to pose installation difficulties, nor too small to limit its usability; This standard size enhances the convenience and functionality for different types of users the ball bearing rollers are made of carbon steel, which is hard, wear , bright without burrs, not easy to rust, and noiseless; This robust material can withstand high stress and heavy loads, offering impressive durability that increases the lifespan of the bearing these 1 inch feature a 360 degree rotation ability; This feature enhances right directional movement, thereby enabling smooth operations; This is useful when transferring goods over different directions, significantly improving productivity and convenience these conveyor rollers have a wide range of applications; They are easy to be installed on most light furniture such as shelves, chairs, serving tables, cabinets, drawer boxes, desks, table saws, miter saws, also can be widely applied in conveyor line installations, processing systems, wooden boxes, transmission furniture, workbenches, , transmission systems Colour:silver Material:Carbon Steel Package Contents: 1 * roller ball set 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.