Eliminate unnecessary holes in the transom of your aluminum or fiberglass boat caused by installing sonar transducers and paddle wheels. Maintenance-free, high-density polyethylene plate will not corrode and is pre-drilled for easy installation. It holds up to 4 accessories and allows unrestricted placement of transducers. Stainless steel screws included. Size:12L x 4W. Color: White. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Size: 4X12. Color: White. Type: Transducer Mounts.