Features: A variety of shapes, wide use, high hardness, strong and durable. Comfortable grip, precise and uniform, clear teeth. For mahogany and other hardwood category timber processing professional file. Can be used for other cases of wood grinding. Specification: Size - 5.5" (140mm) diameter - 3mm application: Used for processing hard wood, metal, deburring, trimming, chamfering and polishing. Rough machining. Suitable for all kinds of wood grinding, metal, jewelry working making necessary model.