To take big flathead however the use of bigger lures is a must. Don't be afraid of a lure's size when you first see it in the box. Just imagine the actual size of an average six inch or 150 mm baitfish, then look back at the lure and you will see what I mean. The depth which a particular lure will dive to is also of great importance, as is the ability of the lure to float or sink. Generally you should chose lures that float, as they are easier to work over an undulating bottom.
Floaters are also easier to retrieve if lost from snags, or from being busted off.
The bib of a lure will decide its individual depth range. When working shallow water, it is obvious that a shallow working lure is needed. This lure will have a bib that is short and pointed down, nearly at right angles to the head of the lure. Deeper diving lures will have their bibs stretched out in front of them, elongated so the water pressure forces them down. This is one area where a trailerboat fisherman has a tremendous advantage over shore based anglers.