The Do-It 3106 RHB-6-12 round head production jig mold allows you to make your 1/2 oz size jig heads in bulk quantities. The barbed collar helps hold soft plastics in place. These gentle barbs are easy on the body, so your soft plastics will be less likely to tear. That means you can be the absolute "terror" of the waters that much longer. 6 cavities, all 1/2 oz jig heads. Uses Aberdeen Jig Hooks Size 2/0, 3/0, 4/0.