background of many gray plastic dowels fastening for thermal insulation. a huge pile of plastic bolts with round holey hats lie

background many gray plastic dowels fastening thermal insulation huge pile bolts round holey hats lie lies foam polystyrene plate wall dowel white industry fixing construction styrofoam home architecture house industrial repairs fortifications material outdoor part build facade fix color mortar dowelumbrella technology building preparing anchor installation saver fixtures panels equipment polyfoam object heat expanded spigot plug peg rubber diameter umbrella