Sea Dog Line Mushroom Anchors. These sturdy Mushroom Anchors are an economical solution for light weight boats. Ideal for canoes, kayaks, or rowboats. The wide-area mushroom cap offers effective holding power in mud and weedy bottoms. The drain holes in the base facilitate easy retrieval, allowing water and mud to dissipate quickly. One-piece cast iron construction with a black vinyl coated finish ensures long-lasting, dependable use.