Yamawa Simple screw inspection tool for no-go SIT-M17X1.5-6H-NB 1pc

The "through" type is blue and the "stop" type is red, making it easy to identify and store.
High-quality materials (HSS) are used, significantly extending the lifespan.
A "step screw" is used at the tip of the screw, reducing the burden of inspection work and improving work efficiency.
The tip of the SIT "through" threads gradually grows larger across the entire thread, making it easier to insert into female threads, and is particularly effective when inspecting fine thread pitches.
Step screws are not used for "stopping".
For stopping