Sintered saws are designed to ensure that the cutting surface is optimally sharp at all times. Sintered saws sharpen themselves during cutting by continuously exposing new layers of diamond.These new blades have diamond throughout the edge and cut aggressively. blades also last a long time, because the diamond isn't just plated on top of the rim. Instead, diamond particles are incorporated into the actual metal of the rim. Cut blades up to 10" in diameter work great with water, but we advise using an additive such as Lube Cool 4800. If you use oil, these long-lasting blades will last even longer! Cut blades have a continuous rim.