Bolts, screws, nuts. Threaded screws M4, M5, M6,M7,M8,M10, M12, M14, M16, M18, M20, M22, M24, M27, M30, M33 Scale in mm. Dwg block of bolts, cad screws for projects of structures, drawings of steel structures. Can be used for civil engineering. Plan and elevation, front view.