Easy and quick: Simple method – the blade is held in the correct sharpening position and the grinding stone rotates. Sharpening one instrument only takes a few seconds. Versatile: For both periodontal and preparation instruments, for both right- or left-handed, the direction of rotation can be selected. Accurate: A dual-position instrument rest. The upper position is for preparation instruments and the lower for periodontal instruments. The original blade form is preserved. Low rotational speed- the blade will not heat up nor will its temper be affected. The fine-grain ceramic stone is 400 grit. Finer and coarser sharpening stones are available as spare parts.