Addi Swing Hooks - Complete Set of 13 Hooks Developed with comfort in mind, the handle is constructed of two plastics: one colorful and soft, and the other, white and firm. The two balance each other perfectly for just the right amount of flexibility. US A (2.00mm), B (2.50mm), C (3.00mm), D (3.25mm), E (3.50mm), 3.75mm, F (4.00mm), G (4.50mm), H (5.00mm), I (5.50mm), J (6.00mm), K (7.00mm), and L (8.00).