Baer Heli Coil Tap - Wire Thread Insert - Bottoming Tap (STI) - UNF - 7/8 x 14Baer Heli Coil Tap Wire Thread Insert Bottoming Tap (STI) UNF 7 8 x 14 When threaded holes take a beating, this Heli Coil Tap is your go to tool for restoring strength and reliability. Specifically engineered to work with Heli Coil wire thread inserts, it delivers clean, precise internal threads that stand up to the demands of repeated assembly and disassembly in challenging environments. The result is renewed hole integrity and a repair you can trust