Overview Material : Diamond plated Brand : Deruilong Color : Graphite Gray Product Dimensions : 6.1"L x 2.6"W x 1.58"H Grit Type : Coarse,Extra Fine,Rough Number of Items : 3 Manufacturer : Shanghai Deruilong Precision Technology Co., Ltd. UPC : 757611907050 About this item High-precision grinding for a combination of rough and finish grinding, rough grinding for restoring severely dulled inserts, and finish grinding for edge grinding Small, lightweight, and portable, it is perfect for sharpening knives, scissors, tools, and any other equipment that requires sharpness Rough sharpen first for polishing, place the knife on the diamond surface and hold it at an angle of about 30°. Move the knife back and forth a few times, then switch to the other side of the knife and repeat the same process. Start with 400# and repeat on the 1000# side No water is needed for the sharpening process. Please remember to clean the knives before cutting after sharpening. For best results, use with water or honing oil If you have any questions, please feel free to contact us, we provide 24-hour professional service