The occupation, 'Locksmiths and Safe Repairers', include: Certified Master Locksmith (CML), Certified Master Safe Technician (CMST), Certified Master Safecracker (CMS), Certified Registered Locksmith (CRL), Forensic Locksmith, and other titles.Locksmiths and Safe Repairers repair and open locks; make keys; change locks and safe combinations; and install and repair safes.