Designed for fast accurate cutting of Cement and MGO Boards. The STS Polycrystalline Diamond blades are perfect for fast and accurate cutting of Fibre Cement Boards. The diamond tipped teeth increase the blade life, ensure a clean cut every time and reduce dust. Wherever possible, use a dust extractor with a suitable filter. For a perfect cut set the cutting depth to 5mm more than the material thickness and cut in a straight line. The two sizes of the blades (160mm and 180mm) work perfectly with all makes of circular saw and each blade comes with a reducing bush for the centre to ensure it holds firm in the saw.