A set of 2 pieces: 1 rollers for upper shower door + 1 rollers for lower shower door The upper rollers have no buffer spring, you can adjust the position of the wheels by adjustment screws Button rollers with buffer springs for secure mounting Wheel diameter: 23mm. Suitable for flat sliding shower doors and curved sliding shower doors Constructed of sturdy zinc alloy, smooth ball bearing and wear-resistant nylon wheel Scene Applicable: These shower door rollers are suitable for most shower rooms, it is convenient to open and close the shower door. Easy to useReplacement shower door roller easy to slide, easy to install and use, with these sliding door pulleys, the shower door will glide like butter. Super FunctionShower door rollers suitable for most bathroom stalls. shower, shower cabins and steam cabins. The product comes with fixing screws, which is very convenient Color: silver Size : pulley diameter 23mm Quantity delivered: 2 pieces (one for the upper lathe, one for the lower lathe) Product dimensions are all measured by hand, there are errors and the actual product shall prevail. The color of the product is affected by the shooting light, and there is a slight color difference, which depends on the actual product received.