Suitable for most shower enclosures, shower cabins and steam cabin enclosures Please note: We only this ONE SIZE screw as this link , if you require different sizes of the screws, you need to purchase by yourself Set of4 Multi-functional small rollers with screw Suitable for most shower enclosures, shower cabins and steam cabin enclosures Materials: Plastic, Nylon, 304 stainless steel micro-bearing POM ABS brass axis Steel part of the wheel: 9mm diameter x 3mm height Wheels approx. 19mm diameter x 4mm thickness