Shinwa Sokutei Circular Saw Guide Ruler with Handle and Auxiliary 60cm 77883 L-Angle Plate,

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Simply place the circular saw against the material and cut it at right angles. The guide surface is equipped with a thin stainless steel plate. The width of the support plate can be adjusted to suit the size of your circular saw (3.5cm, 6cm, 8cm). Squareness: 0.1mm or less per 100mm Scale equivalent to shaku: 2 shaku equivalent to meter: 60.5 cm