Big Gator Tools Standard STI-UNF V-TapGuide
STI-UNF V-TapGuide® - STI-UNF200SNP - Designed for Heli-coil® type taps used with Heli-coil® type inserts. The STI (Screw Thread Insert) V-TapGuide is sized for Standard Ground STI Hand Taps. Great for repair jobs or new Screw Thread Insert jobs. Starts every hole straight and helps prevent tap breakage! 9 Unified Fine Thread sizes, (9 holes): 5/8-18, 9/16-18, 1/2-20, 7/16-20, 3/8-24, 5/6-24, 1/4-28, 10-32, 8-36".