Scotty 473 Stainless steel Rocket Launcher rod holder comes with 344 Flush Mount. Tilts up and down, including upright for rod storage when travelling. Less missed strike opportunities. Rocket Launcher Inside Diameter: 1.70". All post mount Scotty Rod Holders are fully adjustable up and down, rotating 360 degrees. Bolting Dimensions: 1 5/16" x 3 3/16".