More than you think. The spring provides upward or downward movement. It is either fully locked or not fully locked, not half locked. Robust, high-quality hardware, easy to install. It's actually hack-proof to a degree, you'd have to look at it pretty closely to understand how it works. Once you understand this, it is very easy to use. Someone in a hurry will not figure out how to open it. I installed the top and bottom on a double gate and spent a lot of money to sell it.
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