Bralo 22001040004012 is an aluminium/steel-mandrel blind rivet, Ø4.0 x 12 mm, clamping range 6.5-8 mm, supplied in packs of 250. Standard open-end configuration, not gas- or water-tight. Used in sheet-metal fabrication, HVAC ductwork and general assembly where a permanent one-sided fastening is required.