This Knook is a crochet hook with an eye at the non-hook end. It can be used both as a crochet hook and as a knitting needle. Yes, you can knit with one single Knook! It can be used for both flat and circular knitting: even the smallest circumference can be knitted using the knook. (knitPro)
You can also buy size KnitPro Knook size 4.0mm (red) in this website.