Features Accurate Measurement: This thread plug gauge is made of high-quality bearing steel, ensuring precise measurements of internal thread sizes. Versatile Compatibility: With a variety of models available, this gauge can measure thread sizes ranging from M1 to M20, making it suitable for a wide range of applications. Easy to Use: The taper shank design for gauges under 100mm and double screw design for gauges above 100mm make this tool easy to operate and maintain. Reliable Performance: Manufactured with strict quality control standards, this gauge delivers reliable and consistent performance for accurate thread measurements. Brand New and Durable: This thread plug gauge is 100% brand new and crafted with high-quality materials, ensuring long-lasting durability for years of use. Specification: Material: Bearing steel Weight: 14~221g/0.5~7.8oz Model: M1*0.25, M1.2*0.25, M1.6*0.35, M1.8*0.35, M2*0.4, M2.5*0.45, M3*0.5, M4*0.7, M5*0.8, M6*1.0, M8*1.25, M10*1.5, M12*1.75, M14*2.0, M16*2.0, M20*2.5 (Optional) Inspection and measurement process  1. First, clean sheets and impurities must be cleaned before the thread plug gauge and the measured thread are positive, then the thumb and forefinger rotate the ring gauge, so that the thread in the free state can be determined according to the full length of the thread, otherwise it will not be able to determine.  2. After the use of the relevant inspection and metrological institutions inspection and metrology qualified, then the screw plug gauge and the measured thread pair after, use the thumb finger and the index finger rotation ring gauge, screw thread length within 2 pitch to be qualified, otherwise be judged to be non-conforming product.   Package List: 1* Thread Plug Gauge Package List