Grinding coolant concentrate, Five Gallons (19L) , excellent for surface grinding of flywheels, cylinder heads, engine blocks and all other surface grinding applications. works well on cast iron, steel, aluminum and other alloys. Great coolant for belt resurfacers. Contains special ingrediants that help prevent abrasive loading and extends abrasive life. Mixing ratio 40:1 for most applications. Buying in bulk means you get five gallons for the four gallon price.