Chain Size guide
• Free Size - Can be adjusted as short or as long as one wants it to be.
• 16" (40cm) - Loose but close to neck.
• 18" (45cm) - Hangs at collarbone.
• 20" (50cm) - Hangs past collarbone.
• 22" (55cm) - Falls at the top of chest.
This measurement isn't accurate and varies from person to person.