[Quiet] The wheels are made of copper and electroplated plastic alloy. which ensures wear resistance while taking into account the silence.Anti-rust, can be used in humid environment for a long time. [Smooth] The inside of the wheel is a ball bearing, which makes the push and pull of the wheel smoother on the track, very labor-saving. [Easy to install] Please confirm the size of the roller and the diameter of the glass hole you need when purchasing.Install the wheels on the top and bottom of the curved or straight glass doors.The top wheel can be adjusted by stainless steel screws to adjust the height.The height of the bottom wheel spring is automatically adjusted according to the height of the top wheel. [Size]Wheel diameter: 23mm; Wheel thickness: 5mm.Glass door hole diameter:9.5-14mm.The glass hole to the top edge of the glass:≤12mm.Suitable for 4-6mm glass thickness. [Widely used]Aluminum alloy shower door twin rollers runners are ideal shower door rollers replacement and fit most shower enclosures, shower cabins.We recommend that you replace old pulleys in pairs for best effect., Weight: 0.220462262 pounds, Manufacturer: F Season