Features:This product is specifically designed for outdoor enthusiasts ，， pen-shaped design， easy to carry�� Scalable diamond off constantly， electroplated diamond rod for a variety of high-end outdoor knife， including serrated knives. Single crystal diamond having high mesh does not hurt knife sharpener fast characteristics. Diamond bar can reverse stretch， adjust the length of the tool according to the different needs. At the same time， but also with a variety of hooks for grinding a concave groove More value to mention that the high cost of this product， in similar products in some of the price to around US $ 20-25 yuan. (Strongly recommended to other sellers to compare prices.) In quality assurance at the same time (in fact， the quality of this product has far exceeded their products mesh 300 mesh， and the mesh of the products reached 600 mesh) the price of the product even less than one third of them. The last sentence is trying to say: good products， only used to know. Material: electroplated diamond Size: 14cm can be stretched up to 23cm Uses: 1， suitable for outdoor adventure， fishing， etc. Precautions: 1， when the Brothers avoid excessive force to prevent hand touch the tool or hook. 2， the use of part of the revenue should be sharpener tip pen sheath. 3， sharpener and tool Do not place in easy reach of children to avoid accidents. Instructions: 1， grinding tool: Unscrew the pen cap， round diamond rod end paged out to the proper position， tighten the lid Cap. Brothers clenched in one hand， and the other hand in the diamond tool bar back and forth flat portions grinding， grinding to a knife With sharp can. 2， grinding Hooks: Unscrew the pen cap， round diamond rod end paged out to the proper position， tighten the lid Cap. Brothers clenched in one hand， and the other hand holding the hook in the diamond stick "V" shaped groove in the pull back， Ground to be sharp hooks. 3， grinding serrated knife: Loosen the pen cap， the diamond tip end of the rod to bring up to proper position， tighten Cap. Hand and a knife， the blade upward; the other hand clenched sharpener on the use of the tapered surface portion cutter Back and forth grinding， grinding to a sharp tool can be. 4. After grinding tool， with a damp cloth or rinse with water， then wipe dry. Use a soft brush to clean the diamond sharpeners rod portion. Item Includes: 1 X Pen grindstone