The thread gauge is used to check that the thread size matches the specified gauge. The tooth gauge is typically used in production and the tooth gauge can be matched to the tooth profile to confirm unknown thread pitch. Functions: 1. Made of high-quality carbon steel material, anti-corrosive, anti-corrosive, high hardness, durable to use. 2. The thread indicator is clearly marked for convenient and easy reading. 3. The thread pitch gauge is great for measuring the thread pitch of a screw. 4. Small size and light weight, you can conveniently keep it in your pocket or tool bag. 5 . Accurate measurement, simple and rich shape, wide range of applications. Specification: Item Name: Thread Gauge Material: carbon steel Thread Gauge Type: 29 Degree T Thread Gauge, 30 Degree T Thread Gauge (Optional) Gauge for T threads 29 degrees: Number of teeth containing 16 pieces (1-12 teeth): 1, 1-1 / 3, 1-1 / 2, 1-3 / 4, 2, 2-1 / 2, 3, 3-1 / 2, 4, 5, 6, 7, 8, 9, 10, TPI 30 degree gauge for T threads: Contains 12 pieces (2-20mm) in order: 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 16, 20mm Package List : 1 x thread gauge 1. 2. Please be aware: