Digi-SEC RJ45 Cat 6/5e/5 F-F Keystone Coupler (12-Pack, Black) Shipped Fast by Amazon from the US and eligible for Amazon's 30-day returns policy and Prime or Super Saver Shipping RJ45 Female to Female Straight through Connector. Up to Cat 6 Gigabit rated (unshielded) - can be used for Cat 5/5e. Compatible with standard 4-wire RJ11 telephone/fax line Can be used with or without the Keystone Latch. Enables much longer cables to be made from shorter cables. Can be used with 4 wire RJ-11 telephone and fax cable cords Great for small or large multiple LAN workstation installations (temporary or permanent)