The helical rebar was produced by PSB thread bar or MG500 LH thread bar or HRB400 rebar, with machine-cut fine-threaded screw in one end, another end with 45° degree angle.

The matched nuts could be damping nuts and pin nuts, hexagon nuts or square nuts etc, the length from 0.9m, 1.2m, 1.8m, 2.1m, 2.4m to 10.5m, all could be produced as requirements.