Beckson rigid Drink holders can be installed almost anywhere. There is a generous cavity under the flange for caulking installation without fasteners .
They are moulded in stand-offs on the bottom of the standard drink and super size holders to help prevent condensation build up and keep containers from sticking to the bottom with four generous holes that allow for drainage at different angles 
GH43 Standard sizes 
ID: 95mm
width of flange : 111mm
Cup Depth: 83mm
Hole cut: 98mm