3-part, complete system for exact and precise sharpening of blades, grinding angle position for sharpening in 25 °, 30 ° and 35 °, suitable for all chisel, cutter and knife blades from 18 "- 2 38" (4 - 60 mm ) consisting of: guide element for precise and even grinding, grinding stone 8 "x 2" aluminum oxide sand grinding stone, double-sided with fine and coarse surface, white oil for use with grinding stone, non-flammable, non-toxic