Vial-Bridge dual vial connection points and suspended bubble level with reflective platform, allows maximum light refraction for enhanced fluid illumination and sight acquisition in all outdoor and harsh conditions; Jaw-Bone barrel hinge point for easy installation; Single top strap screw for ease of installation and access; Ultra-light, high strength 7075-T6 aircraft aluminum; Mil Spec Type III hard anodizing for durability; Built for left or right handed shooters