How do you read a nail size chart?

Nail size charts classify nails with numbers and Ds, which represent the penny size, and to read the chart, users simply look over the measurements and choose the nails that are correctly sized. Each penny size corresponds to a variety of other physical differences in each subsequent nail class.

The penny size refers to a classic unit of measurement used to measure the nail. The shank diameter number represents the diameter of the nail's shaft underneath the head, which has its own diameter number to help users choose a size. The shank length details the measurable length of the shaft.