304 Stainless Steel Micro-bearing Rollers 8Pcs Replacement Shower Door Roller Wheels 19/23/25mm Diameter Shower Rollers For Curved Doors Specifications: A - Wheel diameter: 19mm. Replacement Shower Door Rollers Description: 4 rollers supplied. 100% new and high quality. Large choice of wheel diameter - 19mm, 20mm, 23mm, 25mm and 27mm (please choose from dropdown menu). Specifications: A - Wheel diameter: 19mm, 20mm, 23mm, 25mm, 27mm (please choose from dropdown menu) by 6mm thickness. 5.3 B - Wheel thickness: 5mm. Linwnil Set of 4 Dia 19mm Stainless Steel Shower Door Wheels Materials: 304 stainless steel micro-bearing., Brass., POM., Nylon outer wheel D - Protruding boss height: 2mm. Showerpart Ltd - Shower Door Rollers Runners and Wheels - Page 12 Grooved Shower Door Rollers x 4., Description: 4 wheels and 4 screws supplied. Shower door rollers are internally threaded. 100% brand new and high quality.