| CLOSED Size A (2.16mm) SPLIT Size XF Small Waxbills and Bicheno (Owl Finches) Finches |
| CLOSED Size B (2.34mm) SPLIT size XF Cordon Bleu, Fire Finch, Lavender, Red Siskin |
| CLOSED Size C (2.49mm) SPLIT Size XF Gouldian Finch and other small finches, Silverbills, Star Finch, Heck's Grassfinch, Zebra Finch, Pictorella, Cherry Finch, Painted Finch, Chestnut Breasted Finch |
| CLOSED Size D (2.67mm) SPLIT Size XF Green Singing Finches, Violet Eared Waxbill, Cut-Throat Finch, Parrot Finch, other Australian Finches |
| CLOSED Size E (2.84mm) SPLIT Size XCS Gloster, Fife and miniature Canaries, Blackcap, Greenfinch, Nightingale, Yellow Hammer, Chaffinch, Bramble Finch, Red Bunting, Diamond Sparrow, Yellow Siskin, and all Nuns |
| CLOSED Size G (3.05mm) SPLIT Size XCL Border, Roller, Red Factor, Japanese Hoso, and Lizard Canaries, Snow Bunting |
| CLOSED Size J (3.30mm) SPLIT Size XCL Yorkshire, Norwich, Crested and Frill Canaries, Corn Bunting, Pekin Robin |
| CLOSED Size K (3.94mm) SPLIT Size XB Java Sparrow, Hawfinch, Shama |
| CLOSED Size L (4.09mm) SPLIT Size XB Button Quail, Bourkes, Parrotlets, Budgerigar, Grass Parakeets, Diamond Dove, Chinese Painted Quail |
| CLOSED Size M (4.34mm) SPLIT Size X3 Redrumps, Manycolours, Lovebirds, Mistle Thrush, Blackbird, Shrike, Glossy Starlings, Kakarikis, Lineolated Parakeets |
| CLOSED Size N (5.33mm) SPLIT Size 1FB Cockatiels, Mealies, Stanley and Golden Mantled Rosellas, Pileated Parrot, Plumheaded Parakeet |
| CLOSED Size P (5.99mm) SPLIT Size 1FB Cloncurry, Pennant, Quaker, large Quail, Doves, Dusky, Peach Fronted & Pyrrhura Conures, African Ringneck, Tippler/Tumbler Pigeons, Maroon Bellied Conure |
| CLOSED Size R (7.04mm) SPLIT Size 1FB Port Lincoln, Twenty-Eight, Blue Headed Pionus, Larger Rosellas, Crimson, Blue-Winged, Nanday, and Sun Conures, Princess of Wales, Moustache Parrakeets, Lesser Hill Mynah, Indian Ringneck, Rainbow, Dusky, Blue-Streaked & Violet Necked Lory, Rock Pebbler, Grey Cheeked Parakeet, Barrabands, Green Cheeked Conure |
| CLOSED Size S (7.57mm) SPLIT Size 2FB Derbyan, Patagonian Conure, Homing Pigeon, Australian King Parrot, Red Lory, Meyer's Parrot, Hahn's Macaw |
| CLOSED Size T (8.69mm) SPLIT Size 3FB Alexandrine Parakeet, Mitred, White Eyed, Red Fronted, Blue Crowned, White Crowned & Scaly Headed Pionus, White Fronted, Yellow Billed and Tucuman Amazons, Dwarf Macaws, Large Lories, Chattering Lories, Senegals, Caiques, Cherry Headed Conure, Red Bellied Parrot |
| CLOSED Size U (9.45mm) SPLIT Size 4PB Goffin, Citron Crested, Lesser Sulphur Crested and Rose Breasted Cockatoos, Timneh African Greys, Severe Macaw |
| CLOSED Size V (11.00mm) SPLIT Size 5PB Congo African Grey, Medium Sulphur Crested Cockatoos, Mexican Red Headed, Yellow Crowned & Red Lored Amazons, and other large Amazons, Turacos, Solomonensis Eclectus |
| CLOSED Size W (12.70mm) SPLIT Size 6PB Triton, Moluccan and Umbrella Cockatoos, Red Sided & Vosmaeri Eclectus |
| CLOSED Size X (14.29mm) SPLIT Size 7PB Scarlet, Green Winged and other large Macaws, Leadbeater's, Palm and Sulphur Crested Cockatoos |
| CLOSED Size Y (15.98) SPLIT Size 8PB Hyacinth Macaw |
Sizes A to Y are now available in steel!