A device for adjusting a sawing device's width, wherein the sawing device comprises at least two circular blades 10, 12, facing each other and adjacently positioned, and a fastener 44 adapted to assemble the blades together. The device for adjusting the sawing device's width comprises a wavy annular spring 14 provided between the blades, a recess 42 provided in each of the blades, wherein the recesses are positioned opposite to one another and wherein said wavy annular spring is received within the recesses, an adjustment member 32 adapted to force the blades together against said wavy annular spring or to part them so as to maintain a predetermined distance between the blades. The distance between the blades is set to present a desired cutting width.