Features： 1、FLOATING MECHANICS: The bike brake disc is designed with mechanical floating mechanics and has the best force angle for better performance. 2、ENLARGED HOLLOW: The disc brake rotor has an enlarged hollow design, reduces weight, better discharges sludge, drain water, and dissipates heat. 3、STURDY MATERIAL: Made of stainless steel and aluminum alloy bracket, all CNC precise manufactured and anodized, sturdy and strong. 4、FLOATING BUCKLE: Stainless steel floating buckle ensures that the outer disc is not directly locked with hub, leaving room. 5、PRECISELY MADE: The bike heat dissipation disc is precisely manufactured by CNC, with a thickness of approximately 1.8 to 1.9mm. Specification： Item Type: Bike Disc Brake Rotor Material: Stainless steel, aluminum alloy Color: Black Hole Spacing: The center distance to the hole is approx. 44mm/1.7in Package List： 1 x Bike Disc Brake Rotor 6 x Screw