The zee rings with the inserts will hold a scope like grim death but having used the non zee signature rings within the past year I found out that their rings are not what they used to be, I believe they are now made in china and the fit between the inserts and the rings doesn't seem right to me, also the set I had was for an 11mm rail however the rings slipped on the rail of a cz 22 mag semi auto because I ran out of tightening adjustment. If youwant a weaver style ring that will really hold try the weaver quadlock, for 14 dollars they are the best deal out there, I put a set on my new 20 gauge slug gun that is light and kicks pretty hard and have had no slip, they have 2 straps per ring, they are aluminum but seem like a real tough aluminum alloy as I tightened down on the screws quite a bit and they took all I could dish out without stripping.