Solidly built with a nice thread protector as well. Be careful with your selection of the adapter #. I bought the #6 for 62mm scope lenses, intending to use it on my nightforce nxs with 62mm objective. The inner diameter of this adapter (with plastic insert) is right at 62mm, but the outer diameter of the nightforce is too large, ~65 mm if memory serves. So to make this work, I had to remove the plastic insert and replace it with some thin gaffers tape (masking tape would probably work also) to keep from scratching the scope body. Without the insert, the inner diameter of this adapter is a hair over 65mm and makes a perfect fit on the nightforce. So be careful, the advertised dimensions seem to be for the scope body's overall diameter at the front objective, not the objective lens itself... at least in the case of the #6.
Pros: Solid construction
Cons: be careful w/ the dimensions!
This review was written in the old system and had content requirements that are different than reviews written today.