Check the listing for details. 1”-THICK Transom Transducer Boat Mounting Board Plate 6.5” PVC W/ NO HOLES. Color: White, Condition: New. Listed at 18.99 USD. 6.5”x 4.5” x 1” PERFECT size for a single transducer or fuel/water separator system. Our team uses these boards on our boats, these are 100% PVC and SOLID! Full 1 inch thick! Sized for all types of marine/boating applications Protects Transom! Below deck will not rot! Textured on back side will hold marine adhesive Routed clean edges. Looks great! Best method is using a high quality marine adhesive on the back, drilling small pilot holes (consult with your boat manufacturers transom specifications) and fully coating screws with same adhesive, then caulking all the way around the board and caulk the tops of the countersunk screw holes last. See my boat as an example for reference. (Pic is a 12” board allowing the addition of a high speed transducer) We have 8”, 10” and 12” boards available as well posted on different listings. Shipping outside the Continental US will add $3.00 for shipping to Puerto Rico, Hawaii and Alaska. Ask any questions, Thanks!