Features: Grindings stone, capable of quickly grindings tool, providing excellent sharply. Aluminum Alloys material, antirust, lightweight. With interchangeably grindings disc and a Magnetic Angles Stands with a 15 angles for fines border and 20 angles for robusts knife. Simply select the angles and use magnetic tool stand to secure knife. Then roll knife back and forth until knife is sharply. Finally, use smooth disc on the other end to polishes border. Suitable for housewives, outdoor lover, and others who need to keep their knife sharply. Can used in kitchen, camping, outdoor barbecues, and other scenario to ensure that knife is sharply and improve work efficiency. Specifications: Material: Aluminum Alloys Color: Black/Primary Size: about 55x86mm/2.16x3.38inch Package Includes: 1x Rolling Knife Sharpener note: Please allow 1-2cm errors due to manual measurement, make surely that you not mind before order. Due to difference between different monitors, the picture may not reflect the actual color.