Helicoil Plus HELICOIL® – Thread Inserts For Metals | Böllhoff Gewindereparatur Drahteinsatz System of Measurement: Metric, Material: Stainless Steel, Type: /, MPN: Does not apply, Grip Range: /, Item Length: /, Model: / HELICOIL® thread inserts have been reliable in practice for over 65 years. They are available in Free Running and Screwlock versions. There is virtually no task that this thread technology cannot handle. The elastic properties of the HELICOIL® thread insert distribute load and tension uniformly