Berkley Aluminum 22 Inch Fish Ruler makes measuring those crappies a heck of a lot easier. They call it the crappie flop for a reason, they start flopping and dont stop. This ruler makes it more convenient to put the nose of the crappie forward to get an accurate measurement. There are pre-drilled holes for easy mounting to your boat or dock. This lightweight aluminum ruler wont sink your boat with weight, but could save it if you have a slot limit.