[Introduction]: Compatible with A/B front fork mounting posts, discs are made of steel, the diagonal aperture of the disc brake disc is 44mm, the disc brake disc thickness is 1.8mm, please install according to the direction of the marked on the disc ( outward) [Advantages]: The Speedbrake disc brake adopts baking paint technology, and the export quality is marked. It is often equipped with a screw stop function with different external devices to prevent the screws from loosening and losing the brake pads, and the brake is anchored. It adds another layer of security! Use it with confidence and reduce worries! Colour:Black&Silver Material:Aluminum alloy + steel Package Contents: 1 pair x bicycle disc brakes 2 x Disc brake disc Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.