The 37-005 is a 25 mm diameter, 3 mm thick Flat Window made from N-BK7 Schott glass, sourced from the reputable vendor Edmund Optics. This Window is designed for use within the visible light spectrum, specifically between 425-675nm, and features standard curve anti-reflective coatings on both the front and back surfaces, as per the 'edm vis-0 std curve' specification. The Window's geometry, defined by its diameter and thickness, along with its Shape (Thin Lens), and Material ID (n-bk7 schott), contribute to its excellent optical performance. The item's web link is valid and indicates that it is currently in stock, ensuring quick and efficient procurement for your optical system needs.