Usage Tips:Material: Made of high speed steel for long life, strong and sharp, anti-corrosion, excellent wear resistance. 5 pieces engraving tools, packed in a transparent box. Three Blade Design: Increased efficiency, ideal tool for precision work such as deep grooves, V-slots, curved patterns and lines . The three-blade design quickly and automatically clears the chips from the hole, suitable for carving, engraving, grinding, drilling and more, and leaving a smooth finish surface. Perfect tool for DIY and Home Repair: Widely usable on different types of wood for DIY, wood carving, model making, making pet houses, house repair and other woodworking. A must-have carving tool for creating your own masterpiece. 5 different sizes (3mm, 4mm, 5mm, 6mm, 8mm) to meet different needs. Universal Shank: 1/8 inch shank fits most rotary tools with a three chuck bit, easy to change. Quality Guaranteed: If there is any problem, please feel free to contact us, we will provide a full refund or replacement and our sincere apologies. We thank you for your support!