This is a reference point/sight attachment for my OTT Titan Hunter range excluding the M95
This sight is fitted like a washer behind the bolts on your brass clips. 
It is designed to be used as shown above.
These clips are a simple yet effective way to increase the visibility of your reference point.
I prefer to use the site with the fibre optic removed as a peep sight but when you purchase a new sight it will come with a small piece of rod that you can use or not
Please note each sight will only fit its matching  frame ie small ott is for the small Titan Hunter