The drill bit for drillers who want to push it to the limit. Drill more meters every day and between regrinds, while enjoying longer bit service life. It’s simply a drill bit for drillers who won’t settle for anything but the fastest, most productive underground drilling imaginable. Is Powerbit Underground for you too? Drifting Tunneling and bolting including the SR22, SR25, R25,SR28,R28,SR32,R32,SR35,SR38,R38,TC35,TC42B Etc thread button bits, cross bits,Reaming equipment and hole openers.