For capturing or sampling bottom fish and invertebrates like crayfish. Just bait the trap and place in current or calm waters. Two halves lock together. Made from 1/4″ mesh, heavy duty vinyl dipped steel. Entrance is inverted funnel shape with a 1″ or 2.25″ wide entrance holes suitable for minnow size fish or invertebrates. Standard trap size is 17″ X 9″ diameter at widest point. Come with clip for rope attachment. Ideal collector for commercial or teaching purposes.