Description:10pcs HSS coated twist drill bit set, wood metal plastic cutting saw drill bit, 3-13mm.Specification:Material : HSS 4241Length : 57/68/73/84/85/86/91/94/103/115mmShank diameter : 3/4/5/6/6.5/7/8/9/10/13mmQuantity : 10pcsSuitable for : thin wood, wood, aluminum, plastic plates pull grooving.Features:1. coating extends service life of the drilling bits;this drill bits can work more than 5 times longer life than normal high speed steel drill tools and non-coated drills.2 Sharper & Much higher Rigidity when in metal drilling applications.3. Shorter cutting lips reduce torque while drilling in high tensile strength materials.4. Because the coating reduces friction,the drill cutter can also perform very well at even higher cutting speeds and feedrate.Package Included:10 x HSS Drill Bit