The Big Jon Otter Boat's Half Weight Keel is made to use with the existing keel to help pull heavy lures, wire, and lead core lines. The Otter Boat will track further away from your boat with the added weight. The Otter Boat's Half Weight Keel comes with easy-to-follow instructions and all the hardware you will need to connect it. Note: Big Jon has made some improvements to the Otter Boat's Half Keel. They are now made out of Stainless Steel instead of Aluminum. The half keel no longer needs a weight attached to it. It will look just like the picture. Width: 8 7/8 in. Height: 9 1/4 in. Manufacturer's limited lifetime warranty The Big Jon Otter Boat's Half Weight Keel is made in the U.S.A.