Material: Made of POM, combining high stiffness and strength with exceptional resilience, favorable sliding friction properties, and excellent dimensional stability. Resistant to fuels and other fluids, as well as high temperatures. Brass shower door roller with stainless steel screws for corrosion resistance, durability, and long service life. Dimension: Roller diameter: 20mm (0.78in); inner hole: 5mm (0.19in); wheel thickness: 5.5mm (0.21in); screw length: 12mm (0.47in). Rolling Component: Ensures smooth door operation with minimal forward or backward movement. Provides effortless rolling performance for shower enclosures and helps evenly distribute the weight of glass doors while controlling directional movement, enhancing durability and extending service life. Waterproof: Lubricated with special ultra-waterproof grease containing PTFE, significantly extending wheel life. Helps prevent moisture-related issues, protects against corrosion, forms a long-lasting water-repellent barrier, and supports prolonged mechanism performance. Uses: Ideal for shower door rollers, massage cabins, bathtubs, whirlpool tubs, and furniture fittings, enabling easy opening and closing of doors.