Specifically designed for hand held operations in materials up to 3/8" thick, these Milwaukee 13/16" Quick Change Sheet Plate Carbide Cutter (49-57-8205) stay sharper longer than high speed steel or bi-metal hole saws. They produce drill press quality holes even in hand held operations. For cutting materials over 3/8" up to a depth of 1/2", a drill press is recommended. When cutting depth is over 1/4", use Hawg Wash cutting fluid to keep cutting surface cool and lubricated. Hawg Wash fluid is available in 16 oz. Bottles (49-32-0081). One bottle makes one gallon of lubricating solution. 13/16" diameter.