(4.8mm = 3/16인치),
(6.4mm = 1/4인치),
(7.9mm = 5/16인치),
(9.5mm = 3/8인치),
(12.7mm = 1/2인치)
(16mm = 5/8인치),
(19.1mm = 3/4인치),
(25.4mm = 1인치).
(38.1mm = 1.5인치),
(50.8mm = 2인치)
(4.8mm = 3/16인치),
(6.4mm = 1/4인치),
(7.9mm = 5/16인치),
(9.5mm = 3/8인치),
(12.7mm = 1/2인치)
(16mm = 5/8인치),
(19.1mm = 3/4인치),
(25.4mm = 1인치).
(38.1mm = 1.5인치),
(50.8mm = 2인치)