A favorite among crochet hooks, the ergonomic addi Swing Hooks have just a hint of flexibility, and fit right into the curve of the hand to allow for more comfortable crochet. The addi Swing Crochet Hook Set includes sizes: 2mm (approximately US A), 3mm (approximately US C), 4mm (approximately US F), 5mm (approximately US H), 6mm (approximately US J), 7mm (approximately US K), and 8mm (approximately US L).