Slick Lube 412 Emulsifying Oil This is a water soluble oil which is used as a lube and coolant in crystal cutting machines. Also excellent for use with diamond coated drills, burs and disks. Keeps diamond coated surfaces from clogging and keeps the cutting surface cool to prevent the loss of diamond particles from extreme heat build-up. Mixes with water in ratios from 10 to 1 up to 20 to 1 depending on application. Sold in 8 oz. bottle.