Only For HSS Annular Cutters: The BDS Cutting oil should be used in pure form without mixing water. While using an HSS annular cutter is 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 lubricant has no effect on the annular cutter. The life of the HSS annular cutters does not increase with normal lubricants. For HSS annular cutters its very important that the annular cutters get COOLING as well as LUBRICATING effect. An 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 the annular cutter will increase the life of annular cutter from 30 – 50% more.