This is a set of F/MM and M/FF. Both should be parallel to a set of two plates. When I ordered them I only received one of the two and had to write to the seller who later sent me the second one. It's hard to pinpoint the source of the error, but they fixed it. I installed them outdoors and they have been there for over 7 months including ice and snow falling on them from the roof. They work every day without the need for adjustment and without any problems in rain or snow. I'm very happy with it and would buy it again if needed.
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