SeaLux Marine Extra Cup Mount Set for Removable Folding Pontoon Ladders 1" tubing / Ladder Insert Plugs SeaLux Marine Extra Cup Mount Set for Removable Folding Pontoon, gunwale Ladders 1" tubing / Ladder Insert Plugs Fits ladder tubing up to 1" outside diameter. Easily attach by dropping ladder hoops into cups. Requires 1-5/8" cut holes to mount to the deck of your pontoon. Constructed from Non-corroding, UV resistant plastic. 3/16" thickness for holding weight load 450 lbs. Easy install and replace existing cup. Require mounting hardware to install.