Shower Door Rollers, TopRay 4pcs Top + 4pcs Bottom Sliding Enclosure Door Glass Roller Replacement (Double Wheel, 25mm) 1. Material: Plastic, Nylon, A Plastic, Nylon BS and stainless steel shower door rollers. 2. Color: White and Grey shower door rollers; Pattern: Double shower door rollers 3. Diameter of the shower door rollers: 25mm; Width of the shower door rollers: 5mm. Minimum Hole size in the glass: 11mm. Suitable for 3-6 mm sliding door glass thickness. 4. These single shower door rollers fit glass shower doors where the distance from the center of the hole to edge of glass is 18mm. 5. Package includes: 4pcs top shower door rollers+ 4pcs bottom shower door rollers