A number of small metal instruments, which when shaken make a loud, ringing noise like tiny hammers on anvils (DH26).
Anyone visiting one of the high-security vaults at Gringotts must carry one of these, shaking it to make noise. The dragon guarding those vaults has been conditioned to back away at the sound, apparently by being taught to fear hot swords whenever it hears the Clankers (DH26).
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