These Pony Aluminum Crochet Hooks are great starter hooks for beginners, and a useful addition to anyone's tool set. All hooks are 15cm long and come in sizes: 2mm, 2.50mm, 3mm, 3.50mm, 4mm, 4.50mm and 5mm. Bigger hooks are available in plastic, in sizes: 5.50mm, 6mm, 6.50mm, 7mm, 8mm, 9mm, 10mm, 12mm, 15mm and 20mm.