Feature●Set of 3 files for ski and snowboard edge●Aluminium Oxide File 20 x 30 mm Grain 150 Blue●Ceramic Stone 20 x 30 mm Grain 1200 White●Diamond Stone 20 x 30 mm K 300 Blue●Ideal for SKS Kunzmann edge grinders - edge sharpeners such as Edge Trick, Sharp Max, Max Edge and much more.Description Set of 3 files for ski and snowboard edge. Aluminium oxide file 20 x 30 mm grain 150 blue. Ceramic stone 20 x 30 mm grain 1200 white. Diamond stone 20 x 30 mm blue - K 300 blue. Ideal for SKS Kunzmann edge grinders - edge sharpeners such as Edge Trick, Sharp Max, Max Edge and much more.