Shower Door Wheels, Lance Home 8 Pcs. Double Twin Top/Bottom, 23Mm Diameter Features: Set of 8 Twin/double Shower Door Rollers (4 top 4 bottom). These single shower door rollers fit glass shower doors where the distance from the center of the hole to edge of glass is 18mm. Diameter of the wheel: 23mm; Width of the wheel: 5mm. Minimum Hole size in the glass: 11mm. Suitable for 3-6 mm glass thickness. Material: Plastic, Nylon, A Plastic, Nylon BS and stainless steel. Color: White and grey. Comes with screw cover caps. Spring loaded action can also fit curved showers. Designed with a nut and a plastic cover. Easy to glide and clean. Package: 8 pcs Shower Door Wheels 1. Package includes: 4 upper rollers and 4 bottom rollers, in total 8pcs 2. These single shower door rollers fit glass shower doors where the distance from the center of the hole to edge of glass is 18mm. 3. Diameter of the wheel: 22mm; Width of the wheel: 5mm. Minimum Hole size in the glass: 11mm. Suitable for 3-6 mm glass thickness. 4. Material: Plastic, Nylon, A Plastic, Nylon BS and stainless steel. 5. Comes with screw cover caps. Spring loaded action can also fit curved showers. Designed with a nut and a plastic cover.