This is a stainless steel semi-automatic fishing hook tying tool. It is used to tie fishing line to fishing hooks. The size is approximately 12cm x 5cm x 1.5cm. Following the steps in the image, anyone can easily tie a neat Snell knot. (※Due to the structure that clamps and secures the hook to the plate, it is compatible with fishing hooks with a thickness of 1mm or less) Also, it's compact size makes it convenient to carry. No batteries required! Shipping is free via regular mail. To prevent any problems, please read my profile before purchasing.