... girlder , which is one kind of sectional steel .the specifications is subjected to the waist high (h) * leg width (b) ... 19*19mm 2)usage:It is used for the struction of building, bridge,cars ,machinary and so on .3)Brand ... and Specification:It is sorted to commen H beam and light I beam with the ... thick, a ,b,c is added befor the type .for example32a#, 32b#, 32c#.. H beam