SMART CUT® Fully Sintered (Metal Bond) diamond wafering blades are fully sintered from OD to ID of the blade. Meaning they have diamonds completely impregnated through the blade. Unlike standard diamond & cbn wafering blades with steel core and diamond section. Instead of having a steel core and small diamond bond edge (usually 1/8"/3.2mm). The diamond edge is all the way through the blade, from its Outside Diameter to Inside Diameter of the blade. You can use until the entire Outside Diameter of the blade is consumed.