we supply rail clips(tension clamp),e-clip,W-clip. we supply:Product name: rail clipMaterial: 60Si2Mn, 38Si7, 60Si2CrHardness Rockwell ... , painted, bituminous coating or other specified by customersSeries:1) I- clip, II- clip, III- clip, IV- clip, V- clip, VI- clip, VII- clip, VII-I clip, E 2007 AV ...