Attwood Air System 2-3/8" Adjustable Height Pedestal Boat Seat Mount 278AO3AM-1This Attwood boat seat mount is designed for use with 2-3/8" pedestals. The added ribs on the mount and positive lock provide excellent strength and stability while out on the water. Easy to mount this boat seat mount features a standard 5" 4 hole mounting pattern and is for use with adjustable height pedestals.Product Features: Air System; Positive Lock; 3 Tilt; AO Helm/Driver Approved;