Check the listing for details. Fine Thread M10 x 1.25 Helicoil Insert 304 Stainless Steel Wire Threaded Inserts. Condition: New. Listed at 3.59 USD. eBay Item Helical Insert Type Free Running Material 304 Stainless Steel Internal Thread Size M10x1.25 Thread Type Metric Fine Thread Direction Right Hand Application For Metal Length 1D,1.5D,2D,2.5D,3D Coil (helical) thread repair insert designed to repair or reinforce tapped holes in soft metals, like aluminum, magnesium, and cast iron. Quick and simple repairs to tapped holes in metal; Lightweight and inexpensive design; Superior thread with greater holding power Used to repair or reinforce tapped holes in soft metals, such as aluminum, magnesium, and cast iron. To repair a tapped hole, simply overdrill and retap the hole with the appropriate STI tap. Thread the insert into place with the appropriately sized installation tool.