The present invention relates to a kit for a device (1) for injection of a product (3) carried by a container (50) having a needle (6), said kit comprising:a housing assembly (300), comprising:an upper housing assembly (100)；a lower housing assembly (200), one of said upper and said lower housing assembly being adapted to receive part of the container； andmeans (110, 210) for connecting said upper housing assembly to said lower housing assembly；a safety shield (10) of the needle； anda needle shield (2) coupled with one of said upper and said lower housing assembly and covering the needle prior to use, the needle shield (2) coupled to a deshielder (15),said deshielder and a portion of said lower housing assembly are provided with guiding means (40, 41) allowing longitudinal translation of the needle shield with respect to the lower housing assembly while preventing its rotation when the needle shield is removed from the device.
