[High-quality raw materials] The diamond chainsaw sharpener is forged with high-quality diamonds, so that the diamonds are firmly adsorbed on the surface, making them not easy to fall off, sharp and wear-resistant, and very durable. [Fine design] The chainsaw file is made of full and high-quality emery, and the shank is carbonized, which is durable and wear-resistant. [Easy to use] The electric file is very easy to mount and can be polished without removing the chain, reducing the number of chain changes and increasing your productivity. [Wide range of applications] The saw chain sharpener is for a variety of applications, can be used for surface decoration lines of metal, stainless steel, iron, copper, wood, plastic and other materials, and can be used for polishing, polishing and deburring jade, wood, mold and steel. [Size] You will receive a chainsaw sharpener in three sizes, 12 of each size, 36 pieces in total. The dimensions are: diameter 4.0 mm, diameter 4.8 mm, diameter 5.5 mm.