Thread Checker, Dasqua 

This thread checker set provides a quick and easy way to measure standard threads in both inches and metric.

They provide all the information you need for screws; diameter, length, threads per inch, hole size and even tap drill sizes. Each piece has a mail and female end to help you identify screws, nuts, or other threaded items.

The metal construction removes the issue of damaging the checker when testing threading which is sometimes an issue with plastic checkers.

Inch Sizes Included: #6-32, #8-32, #10-24, #10-32, 1/4-20, 1/4-28, 5/16-18, 5/16-24, 3/8-16, 3/8-24, 7/16-14, 7/16-20, 1/2-13, 1/2-20

Metric Sizes Included: M4 x 0.7, M5 x 0.8, M6 x 1.0, M7 x 1.0, M8 x 1.0, M8 x 1.25, M10 x 1.0, M10 x 1.25, M10 x 1.5, M12 x 1.25, M12 x 1.5, M12 x 1.75

Note: Spacer beads may vary in color and style.