EXCELLENT SHARPENING PEN: Our diamond sharpening pen is very suitable for general sanding, hunting, outdoor adventure, fishing and other outdoor activities. It is ideal for hunters, fishermen, campers, migrant workers and chefs. PORTABLE DESIGN: This pen knife sharpener is designed like a pen, making it easy to store shirt pocket clips. The round end is designed with a slot, which can be used to sharpen small items such as needles and fish hooks. DURABLE MATERIAL: The diamond sharpening stone pen is made of high quality iron, coated with a emery layer, which is strong and durable, not easy to break, reliable in quality and long in service life. The pen cover part is made of high quality alumina, which is comfortable to touch and easy to grip. It is your ideal tool for outdoor sports. SIMPLE OPERATION: The operation of the whetstone pen is simple and convenient, you just need to unscrew the pen cap, put the diamond handle into the correct position and tighten the pen cap. Then hold the sharpener in one hand and rub the knife over the diamond part with the other hand. After sharpening, wipe the tools with a damp cloth or rinse with water and dry, then clean the sharpener with a soft brush. VALUE COMBINATION: We have 2 sets of pen stone sharpeners in total, one set includes a blue pen sleeve + a diamond sharpening rod, which is enough to meet your daily needs. You can take it with you or use it in the kitchen.