Specification:Item Type: HSSCircularSawBladeSetMaterial: High Speed SteelUses: Mainly used for cutting copper, iron, aluminum, alloys and other medium hard and thin metal materialsSaw Blade Colour: GoldenRotating Tool Mandrel Diameter: 1/8inSaw Blade Diameter: Approx. 44mm / 1.73in, 35mm / 1.38in, 32mm / 1.26in, 25mm / 1.00in, 22mm / 0.87inMaximum Speed: 20000RPMPackage List:5 x Circular Saw Blade1 x Rotating Tool MandrelNote:When using the cutting wheel, try to insert the disc into the end of the mandrel. The screws of the rod must be tightened. Wipe the HSS cutting wheel with a cloth after each use, and wipe with machine oil when not in use.