Set of ring-shaped drill bit stops, used as reference thickness to limit drilling depth. Each ring has the size of the drill bit it is intended for engraved on its surface, so you can quickly choose the right piece. The set covers metric sizes from 3 to 12 mm and imperial sizes from 5/32 to 9/16 of an inch, with a dedicated ring for each diameter. They are suitable for DIY, carpentry and mechanical work where repeatable drilling at the same depth is needed. The metric set measures 8.42 cm by 11.65 cm