... Hardness HRR ≥110 118 Rail Plastic Dowel is a counter-party of Screw Spike, which is pre-inserted into the concrete sleeper ... . We can also make other rail fastenings such as railway screw, plastic dowel, rail pad, railway insulator, rail fish bolt, railway ... base plate, rail anchor, railway shoulder, rail bolt, flat and spring washer, fastening system of E type/SKL type ...