Approximate dimensions:

Size 6/0 - Length 54mm Gape 18mm

Size 5/0 - Length 48mm Gape 17mm

Size 4/0 - Length 45mm Gape 16mm

Size 3/0 - Length 41mm Gape 14mm

Size 2/0 - Length 37mm Gape 12mm

Size 1/0 - Length 36mm Gape 11mm

Size 1   - Length 33mm Gape 10mm

Size 2 - Length 31mm Gape 9.5mm

Size 3 - Length 28mm Gape 9mm

Size 4  - Length 27mm Gape 8.5mm