The sharpness will be restored! It can sharpen easily even impact-hardened blades.
Two types of shape, diamonds or semi-circle can be selected according to your application.

(Note) Regarding the sharpening of the saw blade, if you do too much at once the hard part of the blade will disappear quickly.
Please sharpen little by little. If you sharpen it lightly, you can use the saw for a long time.