Twist drill

The first decision here is the size you need for the specific hole you want to drill. In this range, you’ll find sizes such as 3 mm, 4 mm, 5 mm, and 6 mm, with a 1/4-inch hex shank that fits most standard drill bits. Use a durable metal such as high-speed steel, and if possible, choose a titanium-coated option to improve toughness and corrosion resistance when working with metal. If you want a wide range of uses, choose a set that includes multiple sizes, or a set covering sizes from 1 mm to 10 mm to reduce the need to swap tools during projects.

The most important complex factors here are the head design and the cutting-edge type. A symmetrical head improves accuracy and reduces vibration, while a sharp tip helps the metal drill penetrate smoothly. The titanium coating on some models increases resistance to heat and wear, extending the tool’s life. Sets that include multiple sizes make it easier to select the right bit for the job and help prevent the tip from cracking during use. Choose a bit with a cutting edge suitable for the metal you’re working on, and make sure common sizes like 3–6 mm are available to cover most of your tasks.

A professional who works in a workshop typically needs coverage across multiple sizes, such as 1 mm to 10 mm, to drill a variety of holes without switching tools. Meanwhile, home DIYers benefit from a focused selection like 3–6 mm for small projects and everyday maintenance. A 1/4-inch hex handle also makes it easier and safer to swap bits quickly on common drill machines—supporting steady performance and reducing downtime.

Store the bits in a dry place and clean them after use to remove dust and metal residue. A visual inspection before starting helps you spot any damage to the cutting edge or head. Make sure the shank matches your drill—an 1/4-inch hex shank usually fits most home and commercial drills securely. When storing, keep them in a sealed storage case so they don’t get damaged or bent and remain ready for your next projects.

Yes. Larger sets that cover a wider range, such as 1 mm to 10 mm, offer high flexibility and reduce the need to buy extra tools. Smaller sets are often focused on specific sizes, making them more budget-friendly—but they limit your options. Having multiple choices on the product page makes it easier to select what you need, especially for multi-size projects or regular maintenance in a home workshop.

Start by drilling small holes for lighter metals, such as 3–4 mm for medium holes. If the metal is thicker, use a 5–6 mm size to create a wider hole without over-stressing the tool. If you already have a set covering both intermediate and advanced sizes, choose it to cover different uses without constantly switching tools. This helps you maintain hole quality and reduces the risk of damaging the tip during work.