In Australia, the Slotted Blade is the most common Razor Slitting Blade. It is also known as a Durham Blade or Carpet Blade. The Slotted Blade is available in Round Cornered or Square Cornered options. Various coatings are available such as Black Diamond Coated, Dura Coated, Carbide Coated and TiN (Titanium Nitride) Coated. Other options are Stainless Steel Slotted Blades and Ceramic Slotted Blades. Dimensions are 57mm (2.25 inch) by 19mm (0.75 inch) with thicknesses of either 0.38mm or 0.43mm