Round shakey head jig with flat bottom.  Use the screw lock to hold the nose of the bait in place!  These are made with a heavy wire hook.  1/8 oz and 3/16 oz are made using a 3/0 hook, 1/4 oz, 5/16 oz and 3/8 oz are made using a 4/0 hook!

GAMAKATSU Shakey Head with Screw Lock