임페리얼 1/16, 5/64, 3/32, 7/64, 1/8, 9/64, 5/32, ¼, 5/16, 3/8
미터기준 10, 9, 8, 7, 6, 5.5, 5, 4.5, 4, 3, 2.5, 2, 1.5