Size: Crochet hooks come in different sizes, which may be measured in letters, numbers or millimeters. For example, a general-sized crochet hook is an H-8 5 mm crochet hook. A basic crochet hook set might range from E - J. Size E would be smaller than H, size J would be larger. You typically match your crochet hook size to your yarn weight, which is often on the yarn label. A beginner will usually work with worsted weight yarn and a size G or H crochet hook. Material: A basic crochet hook may be made from one of several common materials. Aluminum, plastic, and bamboo are very common choices, with many people choosing aluminum crochet hooks for their first set. Fancier crochet hooks may be made of clay, glass, wood or other materials. Hook throat: A crochet hook has either a tapered or inline “throat”, resulting in more or less flatness to the hook head. Neither one is better than the other but crocheters who find it hard to work with one may want to try the other. The most common brand of tapered crochet hooks is Boye; the most common inline crochet hooks are Susan Bates.