Features: * Portable simple repair file, no power or air source, suitable for outdoor logging operations. * Model fit: 4.0 is suitable for electric grinding of small 3/8 chain saws; 4.8 is suitable for grinding small 325 and large 3/8 fuel balls, 5.5 is suitable for grinding large 404 fuel balls. During grinding operation, please grind in the direction. Repeated push and pull grinding is strictly prohibited to avoid damaging the edge of the blade. Specifications: Product Name: Round Chainsaw Files Material: Steel Color: Gray Length: (Approx.) 200mm Optional Diameter: 4.0mm, 4.8mm, 5.5mm Suitable for: Chainsaw Grinding Quantity: 3pcs Package includes: 3 Chainsaw Round Files Notes :1. Transition: 1cm=10mm=0.39 inch.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.