5. 316 stainless steel construction of cup holders for boats ensures long-lasting use even in harsh outdoor and aquatic conditions. 2. Wall mounted cup holder comes with pre-drilled holes for self-tapping screws, enabling quick and straightforward installation on any sturdy surface. 4. Wall mounted cup holder provides a secure spot for beverage containers, keeping drinks within during travels on boats or RVs. 1. Crafted from 316 stainless steel, boat cup holders resist corrosion and rust, making them ideal for humid marine and RV environments. 3. Sleek silver stainless steel design of boat cup holders complements most marine and RV interior styles without taking up extra space.