Described is a safety device (30) for a medicament container (20) comprising a first sheath (31) having a first ledge (35) and a second ledge (36), a second sheath (32) telescopically arranged with the first sheath and releasably coupled to the first ledge (35), and a finger flange (50, 500) having at least one resilient clip (72) adapted to engage the second ledge (36) first sheath (31).