UNIVERSAL - Shower door roller for use on 5mm or 6mm glass doors. Low noise - the wheels are abrasion-resistant and non-slip. INCLUDES - The shower door casters consist of 4 casters and 4 bottom casters. Use - Perfect for most shower stalls, shower stalls and steam room enclosures. Satisfaction Guarantee - We care about the well-being of all customers. If this product doesnt meet or exceed your expectations, please return it for a 100% refund, no questions asked. Specification: Condition: 100% Brand New Color: as shown in the picture. Type: single/double wheel (optional) Material: Plastic, Nylon, Stainless Steel 304 POM ABS Brass Axle. Minimum hole size in the glass: 10mm (fits 10mm - 12mm). Fix the center of the screw at the end of the roll: 18mm. Wheel Size: (Diameter) X (H) 25 x 5 mm / 0.98 x 1.97 inch (Approx.) Door Roller Size: (L) x (W) 55 x 43 mm / 2.17 x 1.69 inch (Approx.) Content: 8 x shower door rollers (4 upper rollers and 4 lower rollers with screws and caps) Please note: Please allow 1-3cm error due to manual measurement and make sure you do not mind before placing an order. Please understand that colors may have chromatic aberration due to different placement of pictures.