galvanized wedge expansion anchor bolts and plastic split-ribbed dowel on a black background

16x9 anchor anchoring anchors attachment background black blue bolt building chromate civil closeup coating component concrete conical connect connection construction corrosion different diy dowel drilling engineering equipment expansion fastener fastening fixing galvanization galvanized golden gray hammer hammering hexagonal hole home improvement industrial industry installation mechanical metal nobody nut part pin plastic plug professional protection protective rawlplug reflection repair rod rust safety screw sleeve steel technology thread threaded tool undercut wall washer wedge zinc