Features: *Portable simple repair file, no power or air source, suitable for outdoor logging operations. *Model matching: 4.0 is suitable for electric small 3/8 chain saw grinding; 4.8 is suitable for small 325 and large 3/8 fuel saw grinding, 5.5 is suitable for large 404 fuel saw grinding. *Warning: During the grinding operation, please grind in one direction. Repeated push and pull grinding is strictly prohibited to avoid damage to the blade edge. Specifications: Product Name: Chainsaw Round Files Material: Tool steel(Files), Plastic(Handle) Color: Orange, Black Length: (Approx. ) 290mm Optional Diameter: 4.0mm, 4.8mm, 5.5mm Suitable for: chain saw grinding Quantity: 1Pc Package Contents: 1 x Chainsaw Round Files Note: 1.Transition: 1cm=10mm=0.39inch. 2. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 3. Please allow slight manual measurement deviation for the data.