Usage Tips: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 size chart before purchase. Reliable material: Closet door rollers are made of nylon, stainless steel and hard plastic, precise size, well-made, reliable quality, waterproof and moisture-proof. It not cause parts to break due to frequent sliding, which can long-term use. Easy to use: The guide wheels of kit are fitted with springs to secure them to door opening. the built-in spring, the distance between door and track be slowly adjusted to quickly into bracket and track to complete installation. Efficient repair: With our bi-folding door hardware kit, you can quickly replace and repair broken old doors without replacing 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 parts.Bifold closet door repair part made of 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 Only above package content, other products are not included. Note: Light reflection and different displays may cause color of item in picture a little different from real thing. The measurement allowed error is +/- 1-3cm.