General description AlwaysH 4Pcs Shower Rollers are designed for double sliding doors, featuring 2 upper and 2 lower rollers. These rollers facilitate smooth and effortless sliding of shower doors, making them an essential component for any shower enclosure, cubicle, or steam cabin. Technical specifications Material: Zinc alloy and durable plastic Roller diameter: 23mm Roller thickness: 6mm Glass thickness compatibility: 4-6mm Glass hole diameter: 12mm