9 Unified Fine Thread sizes: 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". The V-TapGuide® is for Helicoil type ground fine thread taps. Great for repair jobs or new Screw Thread Insert jobs. Lifetime Warranty. 100% American made quality.Tap Straight - Every Time! 1 lbs (0.5Kg) shipping weight.