I bought these to mount a cheap 1" tube scope I already had. They were bundled with a set of Vortex Precision Matched 30mm scope rings (made by Seekins aparantly) knowing that later down the line I would inevitably purchase a Vortex scope with a 30mm tube to match. These worked as intended, but were not machined perfectly. One half loosely fit around the 1" tube while one half was very snug around the 1" tube. Its a great way to cheaply mount your 1" scopes if you are POSITIVE that you are going to upgrade to the more common 30mm higher end glass tubes down the line. If you plan on sticking with a 1" tube than I would recommend purchasing a dedicated 1" scope ring, as this was just my "bandaid fix" for the time being. Overall, it was just a great low-cost way for me to get by with my scope.
Pros: They work as intended
Cons: They aren't machined perfectly
This review was written in the old system and had content requirements that are different than reviews written today.