This useful tool is a great addition to any knitters bag. One side has metric sizes, the other US. Very thorough, it can measure the following US sizes: 6-0, 5-0, 4-0, 3-0, 2-0, 0, 1, 1.5, 2, 2.5, 3, 4, 5, 6, 7, 8, 9, 10, 10.5, 10.75, 10.85, 11, 13, 15, 17.

measurements approx: 4"x 3"