The FC/UPC to FC/UPC Simplex Singlemode/Multimode Square Solid Type One Piece Metal Fiber Optic Adapter with Flange is a precision-engineered component designed for stable and low-loss optical connections between two FC/UPC connectors. Manufactured with a one-piece square solid metal housing, it provides outstanding mechanical strength, high durability, and excellent alignment accuracy. The zirconia ceramic alignment sleeve ensures precise fiber core centering and minimal insertion loss, making it suitable for both singlemode and multimode applications.