Baer Heli Coil Tap - Wire Thread Insert - Bottoming Tap (STI) - UNF - 1.1/2 x 12The Baer Heli Coil Tap is the precise, purpose built tool you need for flawless thread repairs and reinforced inserts. Designed to work with UNF threads, this 1 1 2" diameter, 12 TPI tap is specifically engineered to be oversized for wire thread inserts, ensuring clean engagement and optimal alignment when installing Helicoil style inserts. This isnt a generic tapit's crafted to pair with the wire thread insert system for durable, repeatable results.