Brand new, high-quality product! Product Description: - This greenhouse door wheel is suitable for most greenhouses with sliding doors. It comes with bolts and nuts for easy and practical use. - Our greenhouse door wheels are made of nylon and equipped with stainless steel bearings. All screws and washers are also made of stainless steel, making them rust-resistant and durable for long-term use. - The nylon wheel has a diameter of 29 mm and an inner diameter of 18 mm; the screw size is M6x18; and the washer has an inner diameter of 6 mm. These universal sizes are suitable for most greenhouses with sliding doors. - This door wheel replacement kit has a long service life and an attractive appearance. It allows for easy forward and backward movement of the door wheel using the sliding door roller. - The package includes 4 nylon wheels, 4 M6x18 screws, 4 hexagonal nuts, and 4 6 mm washers. Package Contents: 4 nylon wheels 4 M6x18 screws 4 hex nuts 4 6mm washers Product Specifications: Color: White, Silver Material: Nylon, Stainless Steel Wheel Diameter: 29mm Inner Diameter: 18mm Washer Inner Diameter: 6mm Screws: M6x18