1.Standard:50*37*4.5,63*40*4.8,65*40*4.8,80*43*5, 100*48*5.3 2.Size: 5#, 6.3#,6.5#, 8#,10#,12#,12.6#,14#A,14#B 3. 5.44 ,6.635 StandardSizeWeight/m (Kg)50*37*4.55#5.4463*40*4.86.5#6.63565*40*4.86.5#6.780*43*58#8.045100*48*5.310#10.007120*53*5.512#12.06126*53*5.512.6#12.37140*60*8140#B16.73 C Channel Steel & U Channel Steel