10pcs Mini Rasp Bits Wood File Rotary File Drill Bits Carving Drill Bits Woodworking Tool Black Made of carbon steel flame quenched black surface treatment, high hardness, strength high abrasion and high heat resistance This rotary bit set has 1/4 hex shank which suitable for most power drills Suitable for wood , plastic and other soft materials, carving, engraving, chamfering, engraving, grooving, boring and other effects Specification Package includes: 10pcs rotary file cutters Shank Diameter: 6.35MM/0.25 Inch Material: Carbon Steel Color: Black Note: Due to the different manual measurement methods, please allow a slight difference in the size. Due to the light and screen setting difference, the item's color may be slightly different from that of the a photo, but does not affect normal use. High quality: Rotary cutters made of premium carbon steel, flame-tempered black surface treatment, high hardness, high strength abrasion resistance and high heat resistance Easy to use: Safe and reliable, reducing labor intensity and improving the working environment Application: Suitable for wood, plastic and other soft materials, carving, engraving, chamfering, etching, grooving, boring and other effects Note: This rotary file only intended for cork wood and to other soft materials cannot be used for hardwood carving