Stop poking holes in your boat trying to calibrate your fish finder! Use the Bert's Custom Tackle transducer board to mount and adjust your transducers without turning your transom into Swiss cheese. The transducer board securely mounts with just two stainless screws and accepts mounting screws. Made in the USA of durable high-density polyethylene, this transducer mounting plate means less time spent patching holes, and more time catching fish!