Best Cutting Fluid for Aluminum in CNC Machining How to Select a Cutting Fluid Dajin Precision For drilling holes in steel that's 1 8 or thicker, use cutting fluid or a multi purpose oil. Lubricating the bit reduces friction and heat buildup, which makes drilling easier and your bits last Tap Magic Aluminum Tap Magic Coolube 2210 metal cutting lubricant for non ferrous metals Pinewood Derby Pack 180 Upper Arlington, Ohio Zep Lubeze Drill Chill Cutting Oil, 16 oz. Aerosol Can, 12 Cans 4501