a man unscrews the bolt with a hex wrench for adjusting the miter saw, closeup. worker with allen screw with his wrench

adjust adjusting allen assembly bolt close closeup concept construction craft engineering equipment fix fixing hand hex hexagon holding improvement industrial industry instrument iron key machine maintenance man mechanic mechanical metal miter nut person repair repairman screw screwdriver screwed service spanner steel support thread tool twist unscrews work worker workshop wrench