This is the flush brake hardware kit for the Fiend Mills frame. In the box are removable U-brake mounts, brake bolts and a removable cable stop with a barrel adjuster and gyro tabs, so you have everything needed to run brakes.

The hardware threads M8 x 1.25 and the posts are the standard 9mm x 16mm u-brake size. It is listed as compatible with Fiend Mills and Raekes frames, so check yours before ordering.