The 1"-11 1/2 NPT Thread Plug Gage by Vermont Gage is a precision tool used for measuring the size and thread pitch of nuts and bolts in metalworking applications. Made in the United States, this gage is a reliable and accurate instrument for machinists and inspection personnel. With a focus on quality and craftsmanship, Vermont Gage ensures that this tool meets the standards needed for professional use in various industries.