Sako TRG 22/42 Three Ring 34mm Low Scope Mount Phosphate Finish S151F972 Tactical rifle scopes 34 mm tube diameter. 3-optilock rings for reliable fastening of heavy, large rifle scopes. Can be removed and remounted without change in POI. Steel construction, with polymer inner ring collars. Surface finish: Phosphatizing. Integral front attachment for mirage strap. Base with 0.5° and 30 MOA forward angle adjustment for long range Sako TRG 34mm Low (1.41") 30 MOA Scope Mount S151F972