Designed for PVS-15/18-style night vision goggles (NVGs), crafted from aircraft-grade aluminum for lightweight durability. Fits standard helmet rails for secure mounting. Precision rotating knob enables infinite vertical tilt adjustment, ensuring optimal eye relief and alignment with NVG optics. Tool-free operation for fast on-the-go adjustments. Manual measurements with slight error. Please do not disassemble and separate the product.