Emhart Heli-Coil® Tangless Inserts eliminate tang break-off and retrieval and are easily adjusted or removed after installation. The Bi-Directional Design installs quickly and easily from either end of the insert. HELI-COIL Tangless inserts have a bi-directional design allowing the insert to be installed from either end Tangless inserts are available as free running & screw locking Types, with all regular coatings.