【 Product size】 : 3 x 3 mm /0.12 ", 3 x 4 mm /0.16 ", 3 x 5 mm /0.2 ", 3 x 6 mm /0.24 ", 3 x 8 mm /0.31 ", Available in 5 different sizes to optimally meet different needs. 【Material】 :Made of high quality high speed steel (HSS), not easy to break, strong cutting force, high hardness, wear-resistant, anti-corrosion, heat resistant, durable. 【Design elements】 :The use of tricuspid valve design, accurate centering, to create a sharp and accurate sink. The three-sided globoid flash is extremely sharp and automatically drains debris quickly from holes on the side, creating deep grooves, V-shaped grooves, curved patterns and lines, and leaving a smooth surface without harming the wood. 【Easy to use】 :The 1/8 "/3mm shank is compatible with most rotary tools and die grinders, just connect it to the drill bit. In woodworking, you can use it to shape, grind, polish, grind and polish wood. 【Application】 :Widely used in different types of cork, for DIY, wood carving, furniture carving, antique floor carving, bonsai carving, toy carving, figure carving, animal carving and other professional carving, grinding, drilling, model making, home maintenance and other wood products