<p>This water bottle holder is designed to fit over standard 2x4 lumber, making it ideal for workbenches, bunk beds, shelves, and railings.</p> <ul> <li><strong>Dimensions and Mounting:</strong></li> <li>Mounting slot width: 40 mm (slightly over 1½ inches)</li> <li>Upper bottle opening diameter: 89.5 mm (~3½ inches)</li> <li>Lower bottle opening diameter: 79.5 mm (~3⅛ inches)</li> </ul> <p><strong>Bottle Compatibility:</strong></p> <ul> <li>Fits most 19–20 oz bottles in the lower section</li> <li>Larger bottles may fit in the top opening depending on shape</li> <li>32 oz Nalgene bottles do NOT fit</li> </ul> <p>Recommended printing material is PETG. I welcome your feedback and suggestions!</p>