Material: Made of high quality high speed steel, long service life, strong and sharp, corrosion resistant, excellent wear resistance. 5 engraving tools in a transparent box. Tri-Blade Design: Improves efficiency, ideal for precision work such as deep grooves, v-grooves, patterns and lines curves. The three-blade design quickly and automatically removes chips from the hole, suitable for engraving, engraving, grinding, drilling, etc., and leaves a smooth finish surface. Perfect tool for DIY and home repair: Widely applicable to different kinds of wood for DIY, wood carving, model making, pet house making, house repair and other woodworking. An essential sculpting tool for creating your own masterpieces. Please refer to Figure 5 for product dimensions to meet different needs. Universal Shank: 1/8" shank fits most rotary tools with chucks. three jaws, easy to change. Quality Assurance: If you have any questions, please feel free to contact us, we will provide you with prompt after-sales service. We appreciate your support