FC adapter metal housing and either a precision zirconia or a rugged phosphor bronze sleeves. Zirconia sleeve enables stable connection and thus enhances performance, and is ideal for single mode applications. Phosphor bronze sleeve provides durability, and is ideal for multimode applications. Square flange mount and "D" hole mount styles are available. Features : Low insertion loss Good exchangeability and repeatability Zirconia or phosphor-bronze sleeve Simplex or duplex Flange mount style Applications: Telecommunication Computer networks CATV networks Active device termination Instrumentation Export standard packaging