Product Description CARBIDE CUTTER 7/8" QUICK CHANGE STEEL PLATE. The product is easy to use. The product is durable. The product is manufactured in Japan. From the Manufacturer Specifically designed for hand held operations in materials up to 3/8 inch thick, these carbide tipped Steel Plate Cutters 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 inch up to a depth of 1/2 inch, a drill press is recommended. When cutting depth is over 1/4 inch, use Hawg Wash® cutting fluid to keep cutting surface cool and lubricated. Hawg Wash® fluid is available in 16 ounce bottles (49-32-0081). One bottle makes one gallon of lubricating solution. 7/8 inch diameter.