worker is drilling to concrete wall with core drill machine. core drills used in metal are called annular cutters.

abrasive annular background blade bond called carbon closeup color common concrete consisting construction core cut cutter cutters cylinder deformation deformed diamond drill drilling drills electrical equipment generally grit hard hole horizontal hotrolled image images industrial industry machine machinery material metal most motion one outdoor patterns people person photography photos portable power promote rebar remove rock round safety saw site steel surface type typically use used using vehicle wall work worker working