SeaLux Universal Heavy Duty Seat Base Swivel Mount Overall Dimensions: Plate 5-7/8" "x 5-7/8"; Diagonally Measurement: Plate Corner to Corner: 8"; Hole Far Reach: 7-3/8" ;Hole Center to Center: 6-3/4""; Hole Near Reach: 6" Maximum Capacity: 500 lbs. This is a smaller Model, we also has large size av...

Hardware and instruction / installation manual not included. Commonly used by Triton Boats and Bayliner Trophy Boats. Manufacturer lists this as a 10" - 18" adjustable window but we measure it as 10-7/8" - 18-1/2" end to end as shown in photos. Hardware and instruction / installation manual not incl...

Optional to mount with key side facing down to keep water out. Level clamp to screw in with to desire tightness with bolt. Easy clamp on to lock in place. Dimensions- Height: 2 inch (40 mm) Length: 12 inch (303 mm) Width: 1-3/8 inch (35 mm) Installation Instruction does not include in the package