Material: Heavy duty nylon and copper shower door roller Durable, stable and long-lasting, wear-resistant rollers glide smoothly and quietly. Dimensions: Roller diameter: 25 mm, Roller thickness: 5.5 mm, Total length: about 33 mm. Compatible: Glass door thickness: 4-6 mm. Glass hole diameter: 10-12 mm. Wide applications: Shower enclosures: Replacement rollers for shower and massage cabins, bathrooms, jacuzzis and even for furniture fittings. With our shower rollers, sliding doors and systems are easy and smooth. Easy installation: Shower door rollers are easy to move and install. A simple screwdriver is enough to repair them.