Please Note: Do not include ruler The Gator Grip Boat Sleeves are made for mounting your measuring board in your boat for convenience and quick access. Crafted from high density PVC for enhanced durability, they are also pre-drilled with four holes to make mounting simple and easy. Available in multiple sizes to fit a variety of measuring boards, the Gator Grip Boat Sleeves are the perfect way to always have your measuring board ready for action. Boat Sleeve Fits Outside Dimensions Gator Grip Series 2" wide x 1/8" thick boards 6" x 3" x 1/2" Professional Series 2-1/2" wide x 1/4" thick boards 6" x 3-1/2" x 3/4" Weighmaster Series 3" wide x 1/8" thick boards 6" x 4" x 1/2"