Description: Featuring a lightweight design, it adds no extra weight to your bicycle. It has high hardness and long lasting to use because it is made of high quality steel material. With a hollow design, it has fast heat dissipation and quick ventilation. Since it has features of wear-resistant and anti-corrosion, it is more attractive. Made of high quality steel material, it is durable. We have different sizes for you to choose. It is suitable for mountain bike. Item Name: 6 Screws Disc Brake Material: Steel Color: Silver Color Features: High Strength, Hollow, Ultralight Size Details: Diameter: 16cm/6.3", 18cm/7.09" (Approx.) Thickness: 0.2cm/0.08" (Approx.) Center Distance Between The Hole: 44mm/1.73" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Installation Method: Six nails (fixed with six T25 screws), the center distance between the holes is 44mm, as long as it is a standard six nail hub can be installed. Package Includes: 1 x Disc Brake 6 x T25 Screws