Unity Tactical FAST MicroPrism Mount Anodized Black. 26in optical centerline from the rail. It is also compatible with other optics of industry standard mini-prism footprint (heights may vary depending on the optic). It comes standard with a two cross bolt rail clamp but is compatible with the FAST QD (Quick Detach) Lever. FAST is a series of optic mounting solutions that provides end users with a quicker sight picture than standard height mounts. FAST mounts create a 2.26in optical centerline from the rail which allows for more rapid visual processing of the battlefield by ensuring an ergonomically correct heads-up posture. Further they provide faster and easier dot/reticle acquisition while wearing night vision goggles protective masks plate carriers and other gear. COMPATIBILITY: Primary Arms MicroPrism optics and most optics with an industry standard mini-prism footprint MOUNT TYPE: 2 Cross Bolt Rail Clamp FAST QD Lever Compatible (Sold Separately) Specifications for Unity Tactical FAST MicroPrism Mount: Manufacturer: Unity Tactical Color: Black Finish: Anodized Fabric/Material: 7075-T6 Aluminum Height: 2.26 in Weight: 3 oz Condition: New Additional Features: Primary Arms Micro Prism Quantity: 1 Package Contents: Unity Tactical FAST MicroPrism Mount