The hook is designed to prevent thread from slipping, and making picking up and pulling through of stitches easier.
Uniform thickness of the wider part of the shaft will keep the stitches neatly aligned. Stitches with many yarn overs can be made beautifully as well.
The three-dimensional curves on the grip fit your fingertips naturally. This naturally fitting design prevents you from gripping the needle unnecessarily tightly, stopping your hand from getting tired easily.
Made by Clover