Large Offset Trolling Motor PlateThe trolling motor mounting plates, supplied by Sea Brackets, are manufactured using 6061 T6 aluminum, primed and powder coated with added UV protection, for a high-quality and durable product. The tapped holes in the brackets are clean and free of powder coating, as well as gaged for accuracy and consistency for ease of bolt engagement. The manufacturing process is so reliable that the brackets can be used universally for both port and starboard installation.Large 1/2" 6061 Aluminum (compatible with Rhodan QRB, Minn Kota RTA-54, and RTA-62 ) offset mounting plate. (18.5" x 15.5" x 1/2").Suggested Hardware: 1/4" - 20 phillips flat head machine screws Fender washers, backing plates, and locknuts 316 stainless steel is ideal for corrosion prevention Mounting hardware that comes with the Rhodan quick-release bracket or mounting hardware that comes with the Minn Kota RTA-54