pile of plastic wall plugs and steel bolts on a white background

bolt screw wall plug pile fastener isolated white background plastic conical anchor dowel closeup thread steel metal civil engineering construction building industry home improvement component insert rawlplug expansion universal tool equipment drilling hole hollow anchoring fastening fixing attachment connect masonry material stack heap design object mechanical work repair technology gray red industrial type metallic hexagonal head splitribbed lead hardware nylon attach fixation concrete professional quality group diy technical modern nopeople