Sharps are a general purpose sewing needle. They are the most common sewing needle found in the home and used by dressmakers around the world. Sizes 16-18 are commonly called "Carpet Sharps" and, as the name suggests, are used in rug and carpet design.
Size 16 (3/0) 54.5mm length x 1.63mm diameter Size 17 (2/0) 52mm length x 1.42mm diameter Size 18 (1/0) 50mm length x 1.09mm diameter.