old metal male square nut rust screw nail heads attached to plate to concrete floor

wall iron wood white floor furniture window lighting flooring house door drawing number brick carving snow big bolts building carpenter chrome clincher construction detail equipment fasteners female screw group gudgeon hardware head helix industrial industry isolated male material metal metalwork nails nut object old pin plug realistic repair rivet riveter round screw-bolt set side silver steel symbol thread tool top toreutics view washer square rust nail heads attached plate concrete stacked two layers electric pole base structure strong screws