Buck Zipper Guthook Rubber 2607Buck Zipper Knife Gut Hook Hunting Blade The Buck Zipper Knife is a trusted fixed blade gut hook knife designed to make field dressing smooth and efficient. True to its name, the Zipper works just like a zipper, with the perfect blade angle and hook length to ensure clean, precise cuts every time. Originally designed in 1993 by CJ Buck to outperform the many underwhelming gut hooks on the market, this knife quickly earned its reputation as one of the