These are nicely made flush mount rod holders. You will need to obtain your own attachment hardware. I used 1/4 x 20 SS flush mount bolts with flat washers underneath. I bought a few fender washers, but due to the angle, you cant get the larger fender washer on the bolt sometimes. Although the outer Diameter is 2 inches, you will have a much easier time installing if you use a 2 1/8 hole saw.
Nice rod holders 
