Anti-Cant Scope Level with LED Turret and Bubble Illumination - 30mm, 34mm, 1 inch - ZEROLIGHT Scope Ring by iota Outdoors Easily mounts to your scope LED illumination for turrets and bubble level Built-in anti-cant bubble level Made from lightweight anodized 60-61 T6 aluminum for superior strength and resistance to corrosion. Available in 1 inch, 30 mm, and 34 mm sizes.