It Adopts Double-Edge Design, Which Is Designed For Fast Cutting Of Metal (Steel/Aluminum), Stone, Wood And Plastic, And Can Easily Cope With Projects Such As Grinding, Engraving, Deburring, Grooving, Etc. The Slender Blade Design Can Easily Penetrate Into Small Spaces, Which Is An Ideal Choice For Fine Engraving, Trimming And Complex Workpiece Processing. (1/8 Inch) Standard Cylindrical Shank, Perfectly Suitable For Most Mold Grinders Or Rotary Tools Such As Straight Grinders, Angle Grinders And Electric Drills, Selection of 10 commonly used steel alloy drill bits + 10 diamond drill bits (spherical, cylindrical, conical, tree-shaped, etc.), one set can meet various processing needs such as cutting, grinding, engraving, grooving, deburring, chamfering, etc. Our Burr Drill Bit Is Made Of High-Hardness Steel, Which Is And Has A Long Service Life. If You Have Any Questions, Please Contact Us In Time And We Solve The Problem As Soon As Possible Color: Silver Material: Alloy Package Contents: 20*pcs drill bits Only the above package content, other products are not included. Note: Light reflection 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.