A pair of single-action spring hinges, ideal for fire doors and external doors that require self-closing. easier to fit than perko-type concealed door closers and overheads, these hinges have an adjustable spring tension which is adjusted to tension once the hinges are fitted. When the desired tension is reached, a threaded pin is inserted into the spine to lock the tension. Simply open the door and it will then close automatically on spring tension.
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10 year mechanical warranty