The 5/8-24-NS Thread Plug Gage by Greenfield is a high-quality tool used for measuring and inspecting threads in metalworking. This specific gage is designed to check the accuracy of threads with a size of 5/8-24-NS. The green field indicates that it is a trusted brand in the industry, making this thread plug gage a reliable choice for professionals in CNC machining, metalworking, and manufacturing. It helps ensure that threads are manufactured to precise standards and specifications. Thanks for looking!