Standard V-TapGuide® has 32 Standard Ground Tap Sizes: 0-80, 1/64, 1-72, 2-56, 2-64, 3-48, 3-56, 4-36, 4-40, 4-48, 5-40, 5-44, 6-32, 6-36, 6-40, 8-32, 8-36, 8-40, 10-24, 10-32, 1/4-20, 1/4-28, 5/16-18, 5/16-24, 3/8-16, 3/8-24, 7/16-14, 7/16-20, 1/2-13, 1/2-20, 5/8-11, 5/8-18".

Standard size tap guide design is easy to use. Works great on flat surfaces, round parts, and angled edges. "V-groove" design allows perpendicular alignment on round and cornered material. Lifetime Warranty. 100% American made quality. Tap Straight - Every Time!