Screw, has operable arresting unit provided at screw head for blocking rotableness of screw, and locking deice placed in area of screw head and including rotary cylinder latch with key

摘要

The screw has a shank including a thread section (27a) and a screw head (11) with a working surface. A rotatable casing (4) includes a part of the screw head twistable across from a section, which is provided with a part of the thread section. An operable arresting unit is provided at the screw head for blocking rotableness of the screw. A locking deice is placed in an area of the screw head, and has a rotary cylinder latch with a key.