Helicoil M20x40x2.5

A Heli-Coil is a brand of precision-engineered, diamond-shaped stainless steel wire insert designed to repair stripped threads, strengthen tapped holes, and extend thread life in materials like aluminum or cast iron. It acts as a stronger, durable, and lightweight replacement thread that allows the original bolt size to be used, often outperforming the original thread in strength and resistance to corrosion and vibration.