StarTech.com LC to LC Coupler, LC Fiber Coupler, LC/UPC Duplex Keystone Jack, Fiber Optic Keystone Coupler for Patch Panel - LC to LC keystone coupler supports Single Mode and Multimode fiber cables; Ideal for keystone patch panels and wall plates; Toolless setup; Insertion Loss rated below 0.2dB; Supports 9/125um 62.5/125um and 50/125um fiber cores; Includes dust covers