Features: *Made of high-quality materials, quiet, wear-resistant, sturdy, long service life; *Easy to install, the upper wheel adjusts the wheel up and down by twisting the screw, and the lower wheel uses a spring to buckle the inside of the slot; *Applicable to most shower rooms, steam rooms, etc., such as flat sliding doors and curved sliding doors; *Install the upper wheel before installation, install the lower wheel, and then adjust the upper wheel to achieve left-right balance; Requirements: *Suitable for 4-8mm thick glass *The diameter of the glass opening must be greater than 12mm *23mm diameter pulley can be put into the track *The distance between the upper wheel opening and the top is less than 12mm Specification: Color: as shown Material: zinc alloy + stainless steel Pulley diameter: 23mm Glass thickness: 4-8mm Glass opening diameter:> 12mm Quantity: 4pcs (2 up + 2 down) Package details: 4X shower door rollers (2 up + 2 down) Package Include: 2 x Top Rollers 2 x Bottom Rollers Note: 1. All pictures have been professionally color-calibrated, but due to the different ambient light and different display device settings, the pictures you see and the items themselves may have some deviations, please understand. 2.The data are all manually measured, there may be some deviations, but it does not affect the use.