Double female cat6 keystone can be used with Cat 6, Cat5, and CAT5e Ethernet cables. Gold plated contacts and an easy snap-in retaining clip ensure a secure and corrosion free connection. Fits all standard keystone wall plates and panels. CAT6 Keystone inline Coupler for voice, home networking, home office, audio, video, and more. Package Content: 5 x keystone jack couplers (Black). Use it without concern with UL Listed (E521847) and a worry-free 18-month warranty.