The Jefferson Diamond Blade range has been engineered with an extended service life in mind. Increased diamond density and segment heights improve performance over many of our competitors, 10mm segment height on our 4 1/2? and 9? blades and 12mm on the 12? blades and 14? blades, greatly increases the lifespan of our blades. Many of our competitors use between 5 to 10mm for similar sized blades.