- Lam-lord HI97902 step drill bit made of high-speed steel (HSS) with titanium coating, designed to drill holes from 4 to 42 mm in metal, wood, and plastic. - Features 14 diameter levels, allowing you to make different hole sizes without changing tools. - The double flute design facilitates chip removal and ensures clean, precise cuts. - Ideal for DIY projects, construction, and professional applications. - Requires cooling with water or coolant during use to prevent overheating and extend tool life. - Recommended for use with 36V or 48V electric drills, and for diameters over 14 mm, use a bench drill. - Approximate total length: 99 mm; shank diameter: 10 mm. - Versatile and efficient tool for drilling materials such as aluminum, PVC, and wood up to 4 mm thick.