【25mm Shower Door Rollers】Package includes 4 pieces of 25mm diameter double shower door rollers (2 top and 2 bottom). The glass height can be adjusted using the stainless steel adjustment screw on the upper wheel. The lower wheel spring automatically adjusts to the position of the upper wheel. 【Stable and Noiseless Sliding】Shower enclosure rollers are made of copper and electroplated plastic alloy, providing strong support, rust resistance, and durability in humid environments. Door slides smoothly with no noise during operation. 【Easy to Install】Includes anti-collision block and mounting screws for simplified installation and maintenance. Align the rollers with the glass mounting holes and tighten the screws using standard tools. Install the anti-collision block on the track to prevent wheel movement and protect the glass from impact. 【Compatible with 12-14mm Glass Holes】Rollers have a 25mm diameter and fit glass doors with thickness of 4-6mm and mounting hole sizes of 12-14mm. 【Ideal for Bathroom Doors】Suitable for most shower enclosures, shower cubicles, and steam rooms. Installed at the top and bottom of the shower door to ensure smooth opening and closing. A reliable solution for bathroom sliding door functionality.