1/4" Thick 3.5" OD Round Aluminum Countersunk Pad | 3 Countersunk Holes + Center Vent | Marine Grade 6061-T6

Heavy-Duty Round Deck Reinforcement Plate Precision-machined from Marine Grade 6061-T6 aluminum, this 4" Round Backing Plate is engineered to distribute stress for deck-mounted hardware. Featuring a pre-drilled 3-hole countersunk pattern, it is the ideal professional solution for installing pop-up cleats, rod holders, and antenna bases. Ideal for installing: Deck Hardware: Pop-up cleats, fuel fills, and heavy-duty rod holders. Rigging: Antenna mounts, outrigger bases, and fighting chairs. Access Points: Reinforcement for screw-in deck plates and inspection ports. Specifications: Material: Marine Grade 6061-T6 Aluminum Outer Diameter (OD): 4" Thickness: 0.250" (1/4") Mounting Pattern: 3-Hole Countersunk (CS) layout for flush installation. Finish: Fabrication Ready (Mill Finish) - Ready for installation or powder coating. Trust your rigging to Welding World, Inc. Precision-cut aluminum components for professional marine fabrication.