They are used in wooden sleepers, concrete sleepers, bridge sleepers and steel sleepers. Elastic rail clip-E type Diameters: 16mm , 18mm, 20mm Type: e1609, e1809, e1817, e2005, e2007AV, e2055, e2056, e2062 ect. Materials: 60Si2Mn Tension clamp: Diamter: 13mm steel bars Type SKL1 , SKL3, SKL12, SKL14 are available. Materials: 38Si7 and 60Si2CrA