Designed for durability and low insertion loss. Our LGX Fiber Adapter Panel is constructed from 16 gauge steel and includes a one-piece adapter design preventing breakage from stress during changes or adds. All adapter sleeves are constructed of the finest material producing very low insertion loss: Zirconium Ceramic singlemode sleeve insertion loss 0.03 - 0.01 dB, Phosphorous Bronze multimode sleeve insertion loss 0.04 - 0.02 dB. All panels include a clear numbering scheme silk screened on both sides making installs simple. Each adapters is securely attached to panel with screws and spring lock technology. Total Cable Solutions FPP-AD-SU1-06