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Bisagra, que se caracteriza esencialmente por constar de dos placas provistas de sendas espigas para fijar adosadas tales placas al canto de la puerta o ventana y al del marca o equivalente respectivamente, una de cuyas placas está dotada de una espiga vertical de giro, que se combina con dos orificios ciegos prácticos en la otra placa ya sea con uno u otro selectivamente, para variar el sentido de giro, estando la citada espiga montada desplazable a rosca con el fin de ajustar la puerta o ventana en altura.