Metal gas tube for vehicle airbags and production thereof

A gas guide tube has a flattening (13) at at least one tube end (10). The bilateral axial edge regions (12) of the flattening (13) are folded inward in four layers, while the central axial region (17) of the flattening (13) arranged between the two axial edge regions (12) is formed in two layers. The flattening (13) forms a fastening element (25) at least in its two-layer region (17).