Powerful Pair of Magnets with Optional Added Security: The mounting setup uses two 6.6lbs magnets, providing a total 13lbs of holding force The 64oz version comes with a supplementary magnet for enhanced with heavier metal bottles Protective Magnet Casing: Features rubber-coated magnets with a fastener and disc configuration, allowing easy removal or repositioning on any flat metal area without leaving marks Strong Construction: Built with high-strength, molded components, this sturdy bottle holder withstands exposure to sunlight, heat, movement, and everyday wear, making it perfect for outdoor Supports Large Containers: This heavy-duty cup holder accommodates 46oz and 64oz bottles with 4.25in and 5.08in diameters, offering a stable mounting solution for bigger drink containers and mugs Adaptable Attachment Uses: These bottle mounts reliably secure large containers on tractors, recreational vehicles, trucks, forklifts, boats, buses, refrigerators, yard equipment, or exercise machines