Miniature Double Square For High Precision Machine Tool Set-Up

All six sides of the tool steel head block of this miniature double square are ground accurate, square, and true. Thumb nut holds 4 inch scale in secure position end-to-end. Works great for high precision miniature machine tool set-up and accurate layout work. Head block is 1/2 inch thick x 1 inch wide x 2-3/8 inches long.