Ruff's Precision Manufacturing 30mm Riflescope Rings w/Co-Linear Bubble Level Medium - 1.00in Set of 2 Flat Dark Earth. Level significantly aids in accurate scope mounting by giving reference to the cant during the scope mounting process while eliminating the need for multiple small levels and balancing acts Specifications for Ruff's Precision Manufacturing 30mm Riflescope Rings w/Co-Linear Bubble Level: Manufacturer: Ruff's Precision Manufacturing Base/Mount Type: Riflescope Ring Tube Diameter: 30 mm Ring Quantity: Pair Ring Type: Rings Fabric/Material: 6061-T6 Aluminum Features of Ruff's Precision Manufacturing 30mm Riflescope Rings w/Co-Linear Bubble Level Alignment lug to ensure cap/base alignment during cap screw installation Package Contents: Ruff's Precision Manufacturing 30mm Riflescope Rings w/Co-Linear Bubble Level Ruff's Precision Manufacturing CLR-30100-FDE: 30mm Riflescope Rings w/Co-Linear Bubble Level Medium - 1.00in Set of 2 Flat Dark Earth