Product size: Bi-fold door guide wheel hardware kit fits doors from 1 inch to 1-3/8 inch thick.Guide wheel is 2 inches long, wheel OD 7/8 inches, shaft OD 3/8 inches; top pivot is 2 inches long, metal head OD 1/4 inches, shaft OD 3/8 inches, please check the size chart before purchase. Reliable material: Closet door rollers are made of high quality nylon, stainless steel and hard plastic, precise size, well-made, reliable quality, waterproof and moisture-proof. It will not cause the parts to break due to frequent sliding, which can ensure long-term use. Easy to use: The guide wheels of the kit are fitted with springs to secure them to the door opening. Press the built-in spring, the distance between the door and the track will be slowly adjusted to make it quickly into the bracket and track to complete the installation. Efficient repair: With our bi-folding door hardware kit, you can quickly replace and repair broken old doors without replacing the door, suitable for repairing bi-folding closet doors, sliding doors, cabinet doors and so on. Bifold door top guide wheel is commonly used bifold door replacement hardware in the parts.Bifold closet door repair part made of high quality material, with precise size and excellent production, saving your precious time. Quantity:A:4PCS Color:As Shown Material:Metal+Plastic Package Contents: 4 * Bi-Fold Door Top Roller Guide Wheel and Top Pivot