Shimano BR-R9270 Caliper Fixing Screw Rear for 20mm

The Shimano flat mount type C2 rear bolt is used to attach the Dura-Ace BR-R9270 brake caliper to the frame. Depending on the brake rotor size and frame type, the brake caliper is either attached directly to the chainstay or via an adapter. Tighten them firmly with a 4 mm hex tool 6 to 8 Nm.