DO-IT mold model ARK-3-ATK features 3 cavities ranging in size from 1/4oz up to 1/2oz. The Arky jig design is one of the oldest and best producing ever. Now you can make your own Arky jigs with the premium Trokar 800 jig hooks. See table for hook size requirements. Hook size corresponds with lure size from left to right (ie: 3/0 fits in 1/4oz cavity).