Stuart's Original Micrometer Engineers Marking Blue is a precision marking compound designed for metalworking and engineering applications. This versatile workshop essential is specifically formulated for accurate marking out tasks and locating high spots on steel surfaces. Ideal for checking valve seals and general surface preparation work, this marking blue provides a clear, perfect mark on any metal surface regardless of lighting conditions. The compound's lubricating properties make it particularly suitable for use on bearings and working parts, as it cannot cause damage during application or subsequent machining operations. The 38g tin provides convenient storage and application for workshop and garage environments, making it a practical choice for engineers, mechanics and metalworkers who require reliable marking compounds for precision engineering tasks. Features and Benefits:Provides clear marks on all metal surfaces in any lighting conditionsLubricating formula protects