Radius trap door opener, adjustable with bipolar protection diode, fafix 2 mm, can be used with dc and ac voltage, to all common commercial ordinary lock plates, symmetric locks, symmetry ordinary ordinary lock plates, for symmetrical fire doors 10 – 24 v operating current left / right available dimensions (w×h×t): 16×66×26mm Improved version for clearer understanding and better search visibility. Suitable for users seeking detailed and reliable product information.