"The Anchor™ is a universal non-tipping cup holder designed to secure your favorite cup or drinkware container and anchor it to any smooth surface. This portable cup holder will keep your drink from getting knocked over in almost any situation! To use simply set the Anchor down and insert your favorite cup. The Smartgrip® suction base keeps your beverage upright while being hit or rocked. To remove simply lift straight up. From a lack of cup holders on a rocking boat to wagging dog tails, this product will keep your drink upright, and accident-free."