Why Use A Heli-Coil Insert? What makes Heli-Coils so good is their unique design. The wire is diamond shaped, which features a 60-degree outside thread angle to grab and hold the wall of the hole ...

HeliCoil makes stainless steel, spring-like thread inserts that replace the original threads. These come in kits with a number of inserts, an installation tool, and a tap to cut the threads the ...