Go ahead, put your rail in the water... you still won't lose a drop of your drink with this sturdy gimbled drink holder.
It simply snaps on to a 1 in, 1-1/8 in., or 1-1/4 in. binnacle or rail. Sturdy high density polyethylene is UV and impact resistant.
Dimensions, height 4.25 x depth 5.25 x width 4.25