Features: RAM Tough-Tube with 2" long ratchet spline post - Inside tube diameter: 1.9" - inside depth: 10" The ratcheting feature allows for the tube to tilt forward and back 180 degrees and easily secures to your desired position Integrated lanyard tie-downs for optional tethering to your boat Compatible with spinning reels and level wind reels Bulkhead / Flat Surface Base w/ Plunger designed for a flat surface such as the deck or on a vertical surface Locking feature requires the release of plunger to remove the rod holder - four hole mounting pattern: 3.18" x 1.3"* Great for holding other gear too such as nets, flashlights, umbrellas and more Constructed of high strength composite Made in the USA * Attachment hardware not included Brand: RAM Mounts Part number: RAP-394-SSBMPU Warranty: Manufacturer's lifetime warranty