1. To ensure an fit, measure your gate frame and the gate frame gap up to the point where the latch is to be installed to confirm the correct size. During installation, hold the latch against one gate leaf at the desired height (ensure there is nothing at this height that could obstruct the latching or unlatching of the gate) and reattach the Ubolt nuts (tighten fully). 2. Commercial double gate latch with a heavyduty arm for chainlink fences with 3.9 cm gate frames and pipe sizes. Use this double gate latch when gates swing together. 3. Double gate latch with chain link for 3.9 cm wide gate frames. The minimum gap between doors is 3.9 cm, and the maximum gap is 7.6 cm. Will not work if the gates overlap or are offset when closed. If the gates close flush against each other, it should function properly. 4. Hold the latch against one gate leaf at the desired height (ensure there is nothing at this height that could obstruct the latching or unlatching of the gate). Easy installation with no welding required.