"Great quality, very heavy duty hinges which give a beautifully smooth swing. Not cheap but worth every penny and especially suited to heavy fire doors.
I hunted around before settling on these and they were by far the best that I could find in terms of quality, action and appearance.
They would be overkill for lightweight interior doors but my fire doors were 46kg each and needed the strength and durability these offer.
They have a pleasing, functional appearance ideal for modern interiors and I used torx head stainless steel screws to give both a neat finish and avoid the 'cam out' that chews up cross or slot head screws in dense timber."