Crochet hook anatomy: head, throat, shaft, and grip

The parts have different jobs

The head catches yarn and draws it through a loop. The throat guides that yarn toward the shaft. The shaft’s diameter sizes the working loop, while the thumb rest and handle affect control rather than stitch size. A hook that is labelled with the same millimetre diameter can still feel different because the head, throat, surface, and grip geometry differ.

Inline and tapered profiles

An inline hook keeps the head close to the shaft width and often has a deeper groove. A tapered hook narrows gradually toward a more protruding head. Neither form is universally better: yarn splitting, hand motion, stitch height, and grip determine which is comfortable. Steel hooks are made for fine thread and use a numbering system that runs in the opposite direction to many regular hook systems, so compare millimetres.

Size follows the fabric

The yarn label and pattern suggest a starting diameter. Make a swatch in the actual stitch pattern. Change diameter if the measured gauge or fabric character is wrong; do not force your hand to imitate someone else’s tension.

Use the illustration to isolate each hook profile.