[Features] Sharp and durable. Flat side (only one side) is engraved with blade. Other shapes are engraved with blades all around. Equivalent to JIS-B4704. [Specifications] Type: 8 piece set Medium / Total length: 7.9 inches (200 mm) / Blade length: 3.9 inches (100 mm) / Grit size: 01 (coarse), 02 (medium), 03 (fine) / Material: Flat / semi-circle: Alloy tool steel (SKS-8); Round, corner, triangle: Carbon tool steel (SK-2). Metal, Copper, Brass, For grinding aluminum, plastic, etc. Set Contents/Accessories: 1 each of flat, semi-circle, round, corner, triangle, chino, tapered and oval. Note: Set of 5 files to 12 pieces represents the total length. Set of 5: 8.5 inches (215 mm), 8 pairs: 7.9 inches (200 mm), 10 pieces: 7.3 inches (185 mm), 12 pairs: 6.7 inches (170 mm); Please clean it with a brush or other if the file gets stuck in the eyes.