Worker of manual assembly workshop fixing metal components to industrial unit

worker twisting nut metal bolt tightening screw hand manual assembly workshop fixing component industrial man screwing tightly industrial gloves nuts screw metal nuts iron nut process work factory equipment assemblage tighten unit labor plant assemble production industry workplace mechanical conveyor metal parts mechanician assembling human billet detail manufacture manufacturing process manual worker steel industrial process working jo mechanic working with pneumatic wrench during process of assembly of unit factory mechanic working with pneumatic wrench during process of assembly of industrial unit. worker of manual assembly workshop fixing metal nuts on industrial unit with pneumatic wrench mechanic pneumatic wrench clamping tool impact impact wrench thread production line manufacturing enterprise plant equipment manufacturing equipment manual work air impact wrench peumatic pneumatic wrench pneumatic impact wrench"