... 3. Laser print serial numbers/logo 4. Print well protected! Bolt Seal SY-2006 ( Container Seal, High security seal, Metal seal ... transparent layer of cylinder. Laser print same serial numbers on bolt.5. Colors: red, yellow, orange, green, blue and white, various ... . Certificates: ISO9001:2000 ; ISO/PAS 177128. Same serial numbers on bolt and female part for easy handling and tracing and transparent ...