A bone anchoring device (100), comprising:a receiving part (5) for coupling a rod (6) to a bone anchoring element (1), the receiving part (5) comprising a first end (5 a), a second end (5b), and a central axis (C) extending between the first end (5a) and the second end (5b), and an end surface (10) provided at the first end (5a), a recess (52) at the first end (52) for receiving a rod (6), and a head receiving portion (57) at the second end (5b) for pivotably holding a head (3) of a bone anchoring element (1), the head receiving portion (57) being at least partially flexible；a clamping ring (8) configured to be arranged around the head receiving portion (57), wherein when the clamping ring (8) is around the head receiving portion, the clamping ring (8) can assume a locking position wherein the clamping ring (8) exerts a force onto the head receiving portion (57) such that an inserted head (3) is locked and a non-locking position wherein an inserted head (3) is pivotable relative to the receiving part (5, 5')；wherein the receiving part (5) further comprises at least one first engagement structure (54a, 54b) configured to be engaged by an engagement portion of an instrument, wherein the first engagement structure (54a, 54b) is positioned directly at or adjacent to the end surface (10) at the first end (5a).
