A must for finding and reordering the right key. Swiss/continental sizes. Includes 18 Sizes: #000 (1.75 mm), #00 (2.00), #0 (2.25), #1 (2.50), #2 (2.75), #3 (3.00), #4 (3.25), #5 (3.50), #6 (3.75), #7 (4.00), #8 (4.25), #9 (4.50), # 10 (4.75), #11 (5.00), # 12 (5.25), #13 (5.50), #14 (5.75), and #15 (6.00).