Abstract: A key and cylinder lock unit, in which a key contains a shank provided with a pattern and with at least one movable member positioned at the front end thereof, the lock having a plug housed within a cylinder and provided with a plurality of substantially radial pins formed in two parts movable along corresponding radial channels provided partly in the plug and partly in the cylinder and, by way of springs, maintained with one end in the longitudinal seat provided in the plug for the insertion of the shank of the key. The plug contains along the seat a longitudinal groove closed at the key introduction end and housing the tapered end of all the pins, which completely traverse said seat.

Abstract: A key and holder combination includes a holder provided with an impression for housing a key and with an articulated joint element for connecting the holder to the key. The joint is formed in two parts to provide the connection both when the key is housed in the impression and when the key is completely spaced therefrom. The articulated joint connects a corner of the head of the key with a corner of the holder, which has a base and a cover. The hinged and the base are provided with a device which is mutually snap enageable and the thickness of the corner part of the base to which the articulated joint element is applied corresponds to the overall thickness of the base plus the cover, the corresponding corner part of the cover being lacking.