A holder made specifically for your landing nets.  It has an inside diameter of 1.75" (1 3/4"), to accept most net handles.  It is also 10" in length, to hold the net securely. This model has a 70 degree angle to it, and is meant to be mounted "Perpendicular" with the side of your boat, to overhang outside of the boat.
 
This particular product and it's options, are made for flat surfaces, such as gunnels, platforms, etc.
 
Can also be purchased with an aluminum bottom plate and stainless steel mounting hardware, for an additional $7.50
**be sure to select the "with Mounting Hardware" option**
(the picture should show what has been selected)
 
These are made of Aluminum and tig welded together.  Brushed aluminum finish, uncoated.