Discovery Optical Anti Cant Riflescope Bubble Level for Tube Hunting, 30mm / 3" L;

All type available: Upgrade type1: For 25.4mm tube scope upgrade type2: For 30mm tube scope upgrade type3: For 34mm tube scope product specifications: Place of origin: China (mainland) type: Scope mounts & accessories ring diameter: 25.4/30mm/34mm(1/1.1/1.3in) material: Full aluminum alloy thickness: 10mm used on: Rifle scope fit scope: 1inch, 30mm and 34mmtube scope lock: Head screw color: Matte black finish package: Opp bag weight: 24g(1in),18g(30mm),20g(34mm) oem: Yes product features : Technology improved to be more durable and scratch-proof and looks more better light and visible as possible to more easy to measuring the horizontal use this bubble level to make sure your gun level shooting the target mounts quickly and easily to the riflescope tube about apexhorizon optics : Apexhorizon optics is an outstanding outdoor brand from China. Its dreams to build a scope with better clarity and shock proof for large-caliber, which allowed the shooters acquire their target quicklyand to hit targets in all weather and lighting conditions. The meaning of apexhorizon optics is that to see the unknown world, to know what you don't know, to face what you know.