1、Thread plug gauge is a accuracy thread inspection gauge 2、Mainly used to detect the limit major diameter value and the limit small diameter value of the thread. 3、The thread plug gauge is mainly used to detect the thread pitch diameter. 4、For the male thread, if the thread is closed, the diameter of the thread is large; if the thread is stops, the diameter of the thread is small. 5、There is a storage box which is convenient to carry. Features: 1. Thread plug gauge is a accuracy thread inspection gauge 2. Mainly used to detect the limit major diameter value and the limit small diameter value of the thread. 3. The thread plug gauge is mainly used to detect the thread pitch diameter. 4. For the male thread, if the thread is closed, the diameter of the thread is large; if the thread is stops, the diameter of the thread is small. 5. There is a storage box which is convenient to carry.   Specification: Condition: 100% Brand new Item Type: Thread Plug Gage  Optional Style: Type A: Metric Thread, Type B: Inch Thread   Package List: Type A: Accuracy: 6H 1 x M2X 0.4-6H Thread Plug Gage       1 x M 2.5X 0.45-6H Thread Plug Gage        1 x M3X 0.5-6H Thread Plug Gage      1 x M4X 0.7-6H Thread Plug Gage           1 x M5X 0.8-6H Thread Plug Gage            1 x M6X1-6H Thread Plug Gage                1 x M8X 1.25-6H Thread Plug Gage      1 x M10X 1.5-6H Thread Plug Gage         1 x M12X 1.75-6H Thread Plug Gage         1 x M14X2-6H Thread Plug Gage          Type B: Accuracy: 2B 1 x 1/2-20UNF-2B Thread Plug Gage     1 x 7/16-20UNF-2B Thread Plug Gage    1 x 1/4-20UNC-2B Thread Plug Gage     1 x 1/4-28UNF-2B Thread Plug Gage     1 x 5/16-24UNF-2B Thread Plug Gage    1 x 3/8-24UNF-2B Thread Plug Gage     1 x 10-32UNF-2B Thread Plug Gage     1 x 8-32UNC-2B Thread Plug Gage      1 x 6-32UNC-2B Thread Plug Gage      1 x 4-40UNC-2B Thread Plug Gage   (based on your choice)