BROAD COMPATIBILITY - Each LC to LC coupler provides unparalleled compatibility with various multimode fiber patch cords including OM4, OM3, OM2, OM1, 6.25 or 50 micron patch cords. EASY INSTALLATION - Our fiber optic coupler fits all standard size keystone fiber wall plates or patch panels. This universal design provides quick and easy installation using our fiber optic keystone. QUALITY DESIGN - We only deliver the very best to our customers. That's why each fiber optic keystone is manufactured from the group up with quality material. Once you install our fiber optic keystone in your lc wall plate or patch panel, you'll have years of worry free use.