The 12-627 is a dielectric mirror designed for use with 532nm Nd:YAG lasers, offering a 4mm diameter and a thickness of 3mm. This mirror, sourced from Edmund Optics, is a circular, thin lens type component with a dielectric coating on the front surface, specifically the EDM DCURV885300AOI coating. The mirror's geometry is optimized for laser line applications, making it an ideal choice for precision laser operations. The vendor, Edmund Optics, indicates that this item is currently in stock, and further information, including weblinks, is provided in the item data for user convenience.