... price 1) Structural compositionPrestressed extrusionanchor system is composed of extrusion cans, extrusion springs, shims, restraint rings, spiral bars and steel ... is used to make an anchor head of extrusion cans, extrusion springs together with steel strands which provides anchorage ... the beam end.3)Structural diagram of JYM15 1. Extrusion can (including extrusion spring) 2. Shim 3. Steel strand 4. ...