Strong Practical -- A combination set of 6 specifications, 3-step drill bits, and 3 serrated drill bits, meet your diverse needs and improve work efficiency. Precise & Efficient -- Combining the multi-grid drilling of the pagoda bit and the sharp edge of the serrated bit to facilitate the removal of cutting waste when drilling, preventing iron chips or sawdust from scattering, makes drilling cutting faster,more precise, smoother, and more efficient. Durable In Use -- Made of high-quality bearing steel, titanium-plated surface, anti-oxidation, no rust, wear-resistant, long service life. Easy To Carry -- The most commonly used drill size, light and small do not take up space, Can be stored in your toolbox and used anytime, anywhere, convenient and fast. Wide Application -- Titanium coating ensures easily cut through steel sheets, aluminum sheets, copper & plastic & wood board, and many other types of sheet metal ease, Including tile, concrete, tile, brick, wood, plastic, glass, masonry, etc.Wide Application -- Titanium coating ensures easily cut through steel sheets, aluminum sheets, copper & plastic & wood board, and many other types of sheet metal ease, Including tile, concrete, tile, brick, wood, plastic, glass, masonry, etc. Specifications: Material: Bearing Steel Weight:? Boxed (400g)/OppBag(240g) How To Use: Connect the drill bit to the power drill. Use other tools to measure the diameter of the required hole size. Then select the corresponding size of the step drill. Install the step drill correctly on the electric drill, and finally aim at the position of the target hole, which is perpendicular to the workpiece, and then start drilling to the required size. Package Contains: 1 * Titanium Plating Drill Bit Set