This tool has been developed and manufactured for the precise alignment of frame and fork disc brake mounts. It machines each IS mount, Post Mount, and the new Shimano Flat Mount (Front Mount and Rear Mount). Includes two pairs of disc brake mount cutters: one pair for IS mount and one for Post Mount and Flat Mount. The cutters rotate simultaneously for fast and accurate machining processes. Both mounts are machined at the same time, ensuring they are both processed equally and in parallel in one operation. The new generation of cutters allows for machining of steel, aluminum, magnesium, and carbon surfaces. Please use cutting oil.