ITEM NAME:1Inch Round Base Boat Rail Fitting, Ladder Insert Plug Marine Yacht Assembly Description: 100% brand new and high quality. 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. Easy install and replace existing cup. Specification: Material: Plastic Color: Black Size: Screw holes diameter: 0.2" insert plugs diameter: 1" Mounting Hole: 1-5/8" Package Includes: 1 Piece Ladder Insert Plug.1 Piece Ladder Insert Plug. Easy install and replace existing cup. Requires 1-5/8" cut holes to mount to the deck of your pontoon. Material: Plastic. Color: Black.