The RSP Nitro Mastic Tool is a diamond made specifically for mastic removal. However, it can also be used to remove glue and epoxy as well. These tools are getting average life of 5,000-15,000 square feet. Be sure to run your floor grinder at a max speed of 200-300 rpm due to the aggressiveness of this tool.
Since the Nitro Tool is made specifically for mastic removal, not concrete stock removal, this tool is not ideal for grinding concrete, only aggressively removing mastic, glue, and epoxies before using another tool to prep the concrete underneath (depending on aggregate exposure desired).
*Note: this tool can be incredibly aggressive, so it’s ideal for experienced contractors only.