Block Adapter only, individual products and cement block not included. Ensure vertical placement of any individual MossBack Fish Habitat product with the use of the MossBack Fish Habitat Block Adapter. Securely attaches a full-size single or double cement block to product. Ease of use allows for quick, easy assembly and deployment. Do not place in swimming or boating areas. Check your local game laws. The MossBack Fish Habitat Concrete Block Adapter secures a half or full cement block to the base of individual MossBack products to permanently secure the habitat in place and helps to ensure vertical placement.