The saw has 0.023" kerf width (0.6mm) and a maximum depth of 2.5mm.
Please note that the saw is not designed for cutting fret slots from scratch but is great little tool for cleaning out slots when re-fretting and also for deepening slots after the board radius has been sanded as per the above photos.
Use the saw by keeping it level until it is fully located into the existing slot at its maximum depth at centre of the fretboard, then arc the sawing stroke backwards to increase the depth of the fret slot at the edges of the board as required.
Turn the instrument around to work on the opposite end of the fret slots - this is essential over the body area.
Spare Blades are available from the webstore.