【Glass Door Rollers Materials】:26mm sliding shower doors wheels are made from high-quality materials Nylon + stainless steel, these shower door rollers are built to last. They can withstand heavy use and resist wear and tear caused by water exposure. 【Rollers Features】: 26mm wheel shower door rollers, suitable for glass doors with a thickness of 6-8mm, upper and lower wheels are suitable for glass apertures of 10-14mm; the upper wheel can be adjusted by stainless steel screws to adjust the height to 8mm. The height of the lower wheel spring is automatically adjusted according to the height of the upper wheel. 【Smooth and Quiet Operation】: These sliding shower doors runners operate quietly and smoothly, providing a comfortable showering experience without any annoying squeaks or rattles, making it easy to open and close your shower door. 【Widely Uses】Single shower door runners are fit for most shower rooms, shower rooms and steam rooms, and are installed on the top and bottom of the shower door to make it easy to open and close. Easy To Install】The curved shower door rollers come with bumpers and screws for easy installation and maintenance. Simply align the rollers with the glass mounting holes and use a tool to tighten the screws. The bumpers are mounted on the track to block the rollers and prevent the glass from hitting. 【Package Include】Set of 4 Twin Shower Door Rollers ( 2 Double top roller +2 Double bottom roller ) Cokritsm 4PCS Shower Door Rollers, 26mm Sliding Shower Doors Wheels, Replacement Wheels Shower Doors，2xDouble Twin top/Bottom Shower ，Shower Door Runners Pulleys for Curved Glass Doors 4-8mm