Material: Shower door roller made of nylon and copper, sturdy and durable, stable in quality and have a long service life. wear-resistant wheels are smooth and low sliding noise. Suitable for: glass door thickness: 4 to 6mm. Dimensions of the hole in the glass: 10-12 mm.Wide Application: Shower Enclosure - Replacement castors for shower enclosures and massage enclosures, bathrooms, jacuzzi and even for furniture fittings. Thanks to our shower rollers, door and sliding systems can be easily and smoothly.Easy installation: Shower door rollers easy to move and install. For repair, only one screwdriver is needed.Product material: copper and nylon1. Glass opening 10-12MM2. Glass thickness 4-6MM3. The diameter of the roller skate can be based on the size you are currently usingQuantity delivered: 8 pieces