39 in making the second cut to form the bearing surface 41 39 are parallel to one another although it is clearly preferred to utilize electric discharge machining for performing the second of the two cuts since the bearing surface is always parallel to the direction of extrusion it is possible to utilize other cutting means for making this particular cut referring now to fig1 there is shown in plan view another shape of die 35 34 of the present invention looking toward the inlet face 36 34 and the inlet aperture 39 34 it will be understood that such inlet aperture 39 34 represents both the cross sectional configuration of the article and the configuration of the bearing surface 41 34 of the die as such bearing surface 41 34 determines the final cross sectional configuration of the article being extruded fig1 is a plan view of the outlet face 37 34 of the die 35 34 showing the relief surfaces 42 34 in order to show the length of the bearing surface 41 34 in various areas the die will be described section by section basis for example the inlet opening 39 34 has an end segment a of the upper leg has a thickness of 0 045 inch and the length of the bearing surface in that area is 0 035 inch section b also has a thickness of 0 045 inch however the length of the bearing surface in that area is in transition thus section c which is a complex u shape has a thickness of 0 050 inch and a bearing surface with a length of 0 050 inch accordingly the length of the bearing surface in section b varies from 0 035 inch.