you get 8pcs spring-loaded folding door top roller guide wheels and 8pcs top pivots, which can help you quickly replace and repair broken old doors without replacing the door, and the sufficient quantity can meet your use needs these bi fold door hardware kits are made of high-quality stainless steel and plastic materials, which are wear- and anti-deformation, and not cause parts to break due to frequent sliding, which is very suitable for long-term indoor use the closet door roller is 2 inches long, the outer diameter of the wheel is 7/8 inches, and the outer diameter of the shaft is 3/8 inches; the top pivot is 2 inches long, the outer diameter of the metal head is 1/4 inches, and the outer diameter of the shaft is 3/8 inches. For more sizes, please refer to the description in the product picture our folding door hardware has a built-in spring tension device. the built-in spring and the distance between the door and the track slowly adjust, so that it can quickly enter the bracket and track. Push it in and snap it into place. It can be easily installed without additional tools this bifold door hardware kit can effectively reduce the friction and shaking of spring-loaded bi-fold doors, quickly repair old doors , and are suitable for repairing bi-fold cabinet doors, garage doors, barn doors, folding doors, shower doors, storage room doors, etc. Color: As shown Material: Metal Package Contents: 16*pcs bifold door repair kit 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.