Half Round File, Machinists, American Pattern, Cut Type Smooth, Half Round Shape, Length 10 In, Width 0.98 In, Dia 0.272 In, 40 Teeth per Inch, Steel Material, Taper Slightly Towards Head, Used By Tool and Die Makers, Jewelers, Model Makers, and Home Craftsmen For Smooth, Rapid Work On Cast Iron, Bronze, Lead, Babbitt, Aluminum, Zinc, Plastics, and Any Steel Up To The Hardness Of Commercial Tool Steel