an apprentice mechanics greasestained hands tightening a bolt with a wrench

adult adults anvil apprentice black blacksmith bolt closeup construction craft craftsman craftsmanship dirty equipment factory farrier forge generative grease-stained greasestained hammer hand hands heat holding horizontal hot human indoors industrial iron job man manual mechanic mechanics metallic metalwork molten occupation old one people person repair skill smith smithy steel technology tightening tool traditional worker working workshop wrench