Application: Mainly used for wood carving and processing, DIY, model making, household, etc. Available in drill diameters of 3mm, 4mm, 5mm, 6mm and 8mm. More beautiful and smoother work can be achieved when carving bird feathers, fish scales and more details in handicrafts such as deep grooves, V grooves, patterns and line curves. Tricuspid design: Extremely sharp curved surface cuts the hole quickly, removing chips from the hole and leaving a smooth finished surface without damaging the wood. Suitable for carving, engraving, grinding, drilling and more. They are great tools for wood carving. Material: Made of high quality high speed steel, which is very strong and sharp, has a long service life, is corrosion resistant and heat resistant, and is sturdy and durable. Universal Shank: 1/8" (3mm) shank fits drills and most rotary tools such as Dremel, Proxxon, etc. Very compatible and easy to change.