Gami's 604 will not work in that mold. However Mustad, 32746 3/0 will fit in the 1/4 oz and the 1/2 oz. On the 4/0 you can make it fit in the 1/4 oz with a little effort but it fits fine in the 1/2 oz. Just a note, the hook eye portion on the mold halves seems big for the 32746 hook eye. In my experience, when you have that much space around the hook eye in the mold the hook eye wants to fill with lead. However, that might not be the case. I just got this mold so didn't have time to practice.