Special tie screws for insert ARS Insulating Anchor insert range can be used on any concrete rail support, for tightening direct and indirect fasteners. Benefits: Anti-cracking of concrete: patented systemResistance to strain, shock and creep Multiple assembly and disassembly without damaging the threadElectrical insulationVersatility [1] The insert: composite insulating sheath[2] Cellular component[3] Protective cap in P.E.[4] Special trapezoidal thread lag screw Range of available models: