You may notice that until your steel double door frame has been fixed into position in the opening, it is quite flexible. This is perfectly normal. The frame will become rigid once installed into the opening.
For specific advice regarding building the self-assembly knockdown frame for your steel double door, see our comprehensive blog post here
Alternatively, our friendly sales and customer service team will also be happy to help, simply call 01384 220 050 or email [email protected]