Pack of 4 (2x Top and 2 x Bottom) x Shower Door Roller/Runner 23mm dia wheels F23. This set includes two top rollers with adjustable height and two spring-loaded bottom rollers. Made from durable zinc alloy, these rollers are designed to fit various shower enclosures including Victoria Plum, Ocean, and Bath Empire models. The wheel diameter is 23mm and they feature a swivel action suitable for quadrant showers. Manufacturer: Shower Part.