Makes it easy to mount a transom-mount transducer without drilling holes in your boat. Fits boats with 15 -20 high transom and transom thickness up to 2-1/8 . Simple, effective depth adjustment. High-grade aluminum construction. Available: Standard Boat Bracket. Pontoon Boat Bracket - Adjustment range: 18 to 26 . Fits pontoons with up to 4-1/4 platform skirt. Standard Boat Bracket with LCR Mount - Adjustable range from 15 to 24 ; max. clamp opening: 1.75 . LCR mount swivels. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Mounts and Bases.