Yosoo 2PCS Sliding Shower Doors 23mm Wheel Twin Double Bottom Zinc Alloy Shower Door Rollers / Runners / Wheels stainless steel Materials: 304 stainless steel micro-bearing POM zinc alloy brass axis Wheels approx. 26mm diameter x 6mm wide Minimum Hole size in the glass: 10mm Designed for use on 6mm glass doors Suitable for most shower enclosures, shower cabins and steam cabin enclosures