StarTech LC to LC Coupler 10 Pack, OS2 Single Mode SC Footprint LC Fiber Optic Coupler without Flange, LC/APC Duplex Adapter - 10 Pack of Single Mode OS2 LC to LC couplers in SC footprint is ideal for fiber breakout cassettes/enclosures; Toolless setup; Best paired with LC/APC cables; Insertion Loss rated below 0.2dB; Supports 9/125um fiber cores; Laser Optimized