Material: The shower door roller is made of brass, corrosion resistant, no rust, sturdy and durable and long service life. Dimensions: Roller Diameter: 20mm/0.78in; Inner bore: 5mm/0.19in; Wheel thickness: 5.5mm/0.21in; Screw length: 12mm/0.47in. Rolling components: smooth operation of the door, slight forward or backward movement, effortless shower rollers in the shower cabin, hydromassage cabins clearly fulfill their assigned tasks assigned, assigned The mass of the glass, controlling movement in a given direction. This makes the product more durable and lasts longer. Waterproof: It truly prevents problems and protects Prevents product corrosion, forms a long-term waterproof protective layer, and helps extend the life of mechanical devices. Usage: Shower door rollers can easily open shower doors, massage rooms, bathtubs, hot tubs and even furniture decoration rollers. Note: The data is all measured manually, please allow 1-3cm error, due to the difference in light and display, there will be a certain color difference, the actual object received shall prevail .