Professional quality blades with 7mm Tungsten Carbide Tipped teeth to ensure a long working life and accuracy of cut. Each blade has laser cut expansion slots to improve their performance by reducing heat build up.A positive rake blade (POS) is advisable when the workpiece is taken to the saw blade. A negative rake blade (NEG) is advisable when the blade is taken to the workpiece. Diameter: 165mm. Bore: 30mm. Teeth: 18T. Comes with 20 and 16 mm bushes.