Susan Bates Silvalume Crochet Hook Set, Sizes F-K. Trusted for generations and designed for comfort, Silvalume crochet hooks feature an exclusive in-line crochet hook, which helps reduce wrist motion and helps you maintain a consistent gauge. The special anodizing process etches away surface impurities, leaving behind a velvety smooth aluminum surface. Each hook is a different color helping you to find the hook you need quickly.