Rage Powersports 360 Degree Rotating Boat Seat Swivel Mount Zero-Tilt 360 Degree Ball bearing swivel mount non-tilting design Converts a single stationary seat into a rotating chair (2) 6.75" x 6.75" Mount plates with (4) 0.3125" x 0.8125" mounting holes Mounting hardware not included Heavy duty steel construction with a black paint finish