Transducer Shield Lowrance ActiveImaging HD 3in1 Transducer Armor Plate - An Armor Plate is designed to protect the transducer from side to side as well as front and back impact. An Armor Plate takes the place of the factory transom mounting bracket. Designed to fit Lowrance Active Imaging HD 3-in-1 transducer Approximately 10-1/4in long x 2in wide x 1-1/4in wide This item includes stainless steel hardware Easy Do-It Yourself instructions High Quality Aluminum Alloy Black Powder Coated Designed for installation on the boat transom