Rodmaster Interior Diameter: 2 1/8 inches
Mount Dimensions: 4 inches x 2 inches x 2 inches
Bolting Dimensions: 1 5/16 inches x 3 3/16 inches
Accommodates any rod and reel combination including large rod butt tips
Can be mounted on top or side of gunnel
Fully adjustable up and down and with 360 degrees of horizontal rotation
Designed for salmon and other large/medium to small fish