Application: Mainly used for kinds of wood carving and processing, DIY crafts, model making, household maintenance, etc. Available in 3mm, 4mm, 5mm, 6mm and 8mm drill bit diameters. More beautiful and smooth work can be achieved when carving bird feathers, fish scales and more details in crafts such as deep grooves, v-grooves, patterns and lines curves. Tricuspid Design: Extremely sharp curved surface bits quickly remove chips from the hole and leave a smooth, finished surface without damaging wood, suitable for carving, engraving, grinding, drilling And much more. For wood carving, they are excellent tools. Material: Made of quality high speed steel, which is very strong and sharp, has a long service life, is anti-corrosive and heat-resistant , and is sturdy and durable. Universal shank: 1 or 8" (3mm) shank fits drill press and most rotary tools like dremel, proxxon, etc. Highly compatible and easy to change. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.