The BDS Cutting oil should be used in pure form without mixing water. While using a HSS annular cutter ist very important to use cutting oil for longer life of the annular cutter. Many operators use normal lubricant while drilling with annular cutters but, this normal lubrcant has no effect on annular cutter. The life of the HSS broah cutters doe not increase with normal lubricants. For HSS annular cutters its very importnat that the annular cutters gets COOLING as well as LUBRICATING effect. A HSS annular cutter should always be used with cutting oil and not with lubricant/coolant. The use of BDS cutting oil on any brand of annular cutter will incraese the life of annular cutter from 30 – 50% more.