Description This spiral groove drill bit is made of high-class material to ensure durability and stability. It can easily cope with a wide range of tough materials, providing you with a reliable drilling solution. It is strictly designed to make your work more efficient. Come and buy it! Key Features Build to Last: It is made of premium steel, with a titanium coated process, which is wear-resistant, deform-resistant, rust-resistant, and does not fade, ensuring long-term use without frequent replacement. High Performance: With a split tip of 118°, it features a double helix blade and double notch design that not only makes the cut smoother but also prevents filler from flying around, making it easier to remove material particles. Time-saving& Effort-saving: The drill has 12 hole sizes( 0.24 in, 0.39 in, 0.59 in, 0.79 in, 0.98 in, 1.18 in, 1.38 in, 1.57 in, 1.77 in, 1.97 in, 2.16 in, 2.36 in), which can open a variety of specifications and dimensions of the aperture. A step drill is