Steel Gate Box GB2900 is suitable for mounting a Lockey USA keyless lock on a chain link gate. Steel Gate Box is compatible with: 2900, 2930, 2950, 2985 Series Lockey USA pushbutton lock. The GB2900 feature a gate box designed to be bolted directly to a 1 5/8" or 1-7/8" (2") round chain-link gate post. It is nessesary to cut a slot into the Gate Rail.