Related Clues:

• They're cracked by crooks
• Storage units of a sort
• Bank vaults, e.g
• In-the-wall security devices
• Holders of valuables
• Bank boxes
• ''Combination'' items
• Spots for valuables
• Hotel room fixtures
• Places to hold valuables
• Gold storage units
• Oater belt attachments
• Vaults in some walls
• Endless band around iron strongboxes
• Things sometimes hidden behind paintings