【Material:】It is made of POM which combines high rigidity and strength with exceptional resilience, favorable sliding friction behavior and excellent dimensional stability,fuels and other fluids as well as at high temperatures. Shower door roller made of brass, and the screws are made of stainless steel, corrosion resistant, will not rust, durable and have a long service life. 【Dimension】Roller diameter: 25 mm/0.98 in; inner hole: 5 mm/0.19 in; wheel thickness: 5.5 mm/0.21 in; Screw Length: 12mm/0.47 in. 【Roller Component】Smooth door operation, slight forward or backward movement, effortless shower rollers for shower enclosures, hydromassage boxes clearly perform the assigned task, distribute the mass of the glass, control the movement in the given direction. This gives the product even more durability and a longer service life. 【Waterproof】When using a special ultra-waterproof grease with the content of PTFE for shower enclosures, the service life of the wheels is much longer. It