1. 10 different shaped burr bits and 10 different router bits of commonly used types. To fit different wood working situations, meet most of your wood deburring, edge grooving, carving, milling, engraving, drilling needs. Made of high speed steel (HSS) for long life and precise cuts, durable, with good wear resistance and heat resistance. 2. 10pcs HSS Router Bits: 10 different pieces of commonly used router bit types including straight, trim, V groove, beading, cove, slot cutter and more, a useful engraving bits set to meet your different needs. 3. 10pcs Rotary Bits: 10 different burr bits in one set, each burr is shaped to fit different angles or situations, suitable for engraving, beveling, chamfering, grooving, reaming, hollowing. 4. High Compatibility: 1/8 inch (3mm) shank, Length: 1.53 inch (39mm). These HSS carbide rotary files can work with most rotary tools or die grinders (such as Dremel, Wen, Apollo). A valuable addition to any woodworker's rotary tool. 5. Widely Usage: Well-suited for detailed work, such as building and sanding dollhouse furniture, model trains, or miniature buildings and planes. Able to engrave on a range of materials including: wood, ABS, acrylic, PVC, plastics, etc. 6. Size: Shank diameter: 1/8 inch 7. Material: High speed steel 8. Colour: Silver 9. Package Contents: 10 x Rotary Bits, 10 x HSS Router Carbide Carving Bits. Only the above package content, other products are not included. 10. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.