I used all four on a very heavy door (about 125 pounds). They work flawlessly, offering smooth action and plenty of power to get the job done. I've done a lot of searching for high-performance, budget-priced hinges and these showed the most promise. I'm happy with the result. I didn't use their screws - they seem to fit, but I needed longer ones that would pierce the skin and still dig at least an inch into the solid door structure.
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