big bolt with a nut covered with brown paint old screed on a blurry brickwork background close-up

background big black blurry bolt border brickwork brown build closeup components connection construction corrosion covered dark design detail element equipment factory fastener fix grunge head hexagon industrial iron machine macro material metal metallic nut object old one paint painted pattern pieces rotary rough rust rusty screed service socket space spiral steel structure surface technology texture tool wallpaper washer weathered work