| 摘要 |
Door spyhole (viewer) which comprises a central body 1 having at its rear part at least one screw thread 1a and at its front part at least one optical device 5, a sleeve 2 ending in a collar 3 holding a closing-off flap being screwed onto the part 1a of the central body 1 equipped with the rear optical device of the door spyhole (viewer), characterised in that, in order to use the spyhole (viewer) in different door thicknesses, provision is made to place, between the threaded part 1a of the central body of the spyhole (viewer) and the rear sleeve 2 placed on the back face of the door, at least one extension sleeve whose front part is screwed onto the threaded part of the body 1 and in which the central part of the extension sleeve can receive the internal thread of the rear sleeve 2. <IMAGE>
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