Hello all, I did a little research and came up with this information about safety pin measurements and sizes. Safety pin sizes • Size 00 or 2/0 = ¾ inch • Size 0 = 7/8 inch • Size 1 = 1-1/16 inch • Size 2 = 1-1/2 inch • Size 3 = 2 inches • Size 4 = 3 inches Cathy F