HRLORK Step Drill Bit 4mm-22mm Cone Drill Bits Hole Cutter Titanium Coated Hard Metal Spiral for Wood Drilling- 1 Pcs

High-Quality Material- Crafted from durable High-Speed Steel for superior strength and longevity, ensuring reliable performance for various drilling applications. Two-Flute Spiral Groove Design- Enables a faster, more stable and smoother cutting. It can automatically chamfer the hole to clean the drill bit. Multiple Sizes- With sizes ranging from 4mm to 22mm, this set allows you to cut multiple hole sizes with the same drill bit, saving you time and effort without the need to constantly change bits. Multiple Application- Cone drill bit Suitable for Hard Metal such as Stainless Steel, Steel and Cast Iron as well as Wood, Aluminum Alloy and Other Softer Metals. Try to adjust the RPM when it fails to penetrate. Precision Ladder Design- The ladder shape and the bifurcated tip design of the cone cutter drill bit not only ensure the cutting speed and accuracy, but also prevent the slippage during the drilling process.