This is an extremely durable diamond lapidary blade. It is a trim saw blade and is made in China. It is the only trim saw blade I will use and is the blade in my videos on YouTube. The diameter of this blade is 7 7/8 inches. It is manufactured for use in China and is the reason it is not a standard 8 inches. The bore hole is 5/8 which is the only size I could obtain. The kerf is about the thickness of a dime. I cut lots of rock in a year and use only 2 or 3 blades a year for cutting. I also use them as a grinding wheel when 6 or 7 are ganged together with a thick washer between each blade on an arbor.