The curved shower door roller is made of , Anti-corrosion, sturdy and durable, long service life. 8 curved shower door rollers with a diameter of 23mm, including 4 top rollers and 4 bottom rollers. The fixed pulley of the shower door can be removed and cleaned with one click, which is very convenient. 23mm diameter curved shower door wheel, suitable for glass doors with a thickness of 4-6mm, the upper and lower wheels are suitable for glass apertures of 12-14mm; the height of the upper wheel can be adjusted to 8mm through stainless steel screws. The height of the lower wheel spring is automatically adjusted according to the height of the upper wheel. Shower glass door rollers help the door slide smoothly and there is no noise when opening the shower door. Curved shower door rollers are suitable for massage rooms, bathtubs, whirlpool tubs, and even furniture. Make sure your door opens easily and smoothly with our shower glass door rollers. Replacement shower door wheels come with bump blocks and mounting screws for easy installation and maintenance. Colour:silver Material:plastic Package Contents: 4 pairs x pulleys 8 x anti-collision blocks (The color of the anti-collision block is random, no specified colors are accepted) 8 x screws Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.