Type: Extra-Coarse; Size: 70x25x5mm / 2.76x0.98x0.2 inch (L*W*H); Packing List: 2Pcs 360 Grit Mini Ski Snowboard Diamond Edge File Advantage: This mini snowboard whetstone is made of durable diamond material, providing the best cutting effect, with sharp grinding and good wear resistance. The diamond stone sharpener is compact and portable, meaning you can do your sharpening anywhere. Instruction: Simply rub the along the entire length of your ski or board's edge for a smooth finish. Application: This is a whetstone specially designed for the outdoor snowboard. The extra-coarse snowboard diamond edge file is used for removing edges damaged by the rock. Note: Please confirm the required size and style before purchase.