Digi-SEC Heavy Duty RJ45 F-F Coupler (12-Pack, Black-UTP(Unshielded)) Shipped Fast by Amazon from the US and eligible for Amazon's 30-day returns policy and Prime or Super Saver Shipping Heavy Duty RJ45 Female to Female Straight through Connector Cat 6 Gigabit rated Enables much longer cables to be made from shorter cables. Great for small or large multiple LAN workstation installations (temporary or permanent)