Fig. 57 shows cross sections of some of the shapes produced by this process. Besides the four shapes of bars at the top there are shown a few special shapes as follows:

Fig. 57. - Extruded Shapes.

A - Fluted column for interior architectural work. B - Hand railing for interior architectural work. C - Stair tread. D - Door sill.

E - Moulding. F - Angle bar. G - I-Beam.

Extruded shapes are extensively used for high-grade interior architectural trimming, as well as for ornamental structural work where strength is a factor. In many cases the bars may be cut in short pieces and thus supply shapes which ordinarily must be produced by casting. The extruded metal needs no further finishing, as it has smooth and even surfaces.

Lead pipe is produced by the extruding process.