StarTech SC to SC Coupler 10 Pack, OS2 Single Mode SC Fiber Optic Coupler with Flange, SC/APC Simplex Adapter - 10 Pack of Single Mode OS2 SC Simplex Couplers is ideal for fiber panel mounts/enclosures; Flanged design for fixed panel mounting; Best paired with Single Mode SC/APC simplex cables; Supports 9/125um fiber cores; Laser Optimized