Enhanced Bicycle Brake Disc - Increased strength at edge reinforcement by more than 30%. Stainless steel brake disc reinforcement material, strong heat dissipation, decontamination and drainage design, high strength aluminum alloy material, stainless steel floating buckle. International standard hole spacing 44mm. Precision design - CNC precision manufacturing, high hardness, unique cooling design, stamping molding, high hardness, the thickness of the outer frame is about 2mm. Stainless steel floating buckle design, paint protection, so that the outer plate and the hub of the wheel directly locked, leaving room for expansion. Anodized, corrosion resistant, no rust, martensitic stainless steel, hollow out, new upgrade, polished, good corrosion resistance, improved strength, more high-end. Material - The inner frame has good hardness, toughness, metal anodizing treatment, superior corrosion resistance, reinforced Angle design, with better tensile strength and shock absorption. Stainless steel material, hardness 38-42, good wear resistance, toughness, corrosion resistance, tensile resistance, not easy to deformation. Specifications - 160MM 180MM 203MM (one pack of mounting screws per model of this bike brake disc) Note - (Need to know the correct model you need before ordering in order to get the correct brake disc). Specifications: Product name: Bicycle brake disc Material: Metal Size: 160mm 180mm 203mm Hole center distance: 44mm Package Included: 1x Bicycle brake disc 6x screws Notes: 1. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you 2. Please allow 0.1-2cm measuring deviation due to manual measurement.