Professional rotary wood file rasp drill bit set. Rod diameter: 3mm round rod; Made of carbon steel, flame-tempered black surface treatment, sharper, more durable.Polished DIY woodworking artifact. Easy to operate, safe and reliable, can reduce labor intensity. Used for grinding, polishing, shaping and burnishing of wood, plastic and rubber surfaces. Note: This rotary file only intended for wood cork and other soft materials cannot be used for hardwood carving.Features:Made of carbon steel, fire-tempered black surface treatment, sharper, more durable.Used for grinding, polishing, shaping and burnishing wood, plastic and rubber surfaces.Polished DIY woodworking artifact.Specification:Material: carbon steelShank diameter: 3mm round shankQuantity: 10pcsContents:10 x 3mm Rotary File Drill Bits Note: The data are all manual measurement, please allow 1-3cm error, due to the light and display difference, there are will have some color difference, depending on the physical item received.