Best Steel Core Drill Bits of 2026

This 30-piece diamond drill bit set is perfect for jewelry making and stone drilling. The 1mm bits are compatible with Dremel and other rotary tools, and the solid steel body spins true for accuracy. The triple layer diamond coating makes starting easy, and the bits can be used on beach glass, sea shells, stones, ceramic, and porcelain. To use, start drilling at an angle and then go vertical later, submerging the tip of the drill in water for best results.

The BOSCH Impact Tough Bit is an effective tool for drilling through various materials. Its no skate tip ensures accurate starts, while its long flutes allow for efficient material removal. The impact-rated shank provides higher torque for drill/drivers, making it a versatile option for any job. Additionally, the black oxide coating reduces friction, extending the bit's lifespan. Lastly, the laser marking feature clearly identifies the bit's diameter, making it easy to locate the right size. With these features, the BOSCH Impact Tough Bit is a reliable and efficient choice for any drilling task.

These core drill bits are designed to drill through concrete, concrete with light steel reinforcement, or hard masonry. The embedded diamond concentration ensures a longer core life and efficient drilling. The 1-1/4"-7 threaded arbor and 14" drilling depth make them versatile for different projects. They are recommended for use with handheld core drills or dedicated core drill rigs in rotary mode only.

KURSTOL Drill Bit Set includes 10 industrial-grade tungsten carbide drill bits ranging from 1/4" to 1/2". The quick-change shank allows for easy swapping between sizes. The precise cross head design minimizes slipping, ensuring stable drilling. The spiral groove aids in chip removal. Compatible with various drills, this set is suitable for wood, plastic, brick, ceramic, and more. Not for use in impact or hammer mode. Ideal for accurate drilling and pre-drilling applications. Suitable for dry drilling and materials requiring coolant.

The DAYDOOR Diamond Hole Saw is a versatile 13-piece set designed for drilling through various materials, including porcelain tiles, granite, and marble. Made from high-quality diamond and carbon steel, these tools ensure durability and efficiency, allowing you to complete projects with ease. The hollow design and U-shaped grooves facilitate quick debris removal and minimize heat buildup, enhancing your drilling experience. With multiple sizes included, you can tackle a wide range of tasks, making it a practical choice for both DIYers and professionals alike.

The EXFEIN Diamond Drill Kit offers a versatile 12-piece set designed for drilling and trimming holes in materials like porcelain, ceramic tile, marble, and granite. It includes multiple diamond core drill bits in various sizes, finger bits for enlarging holes, and a chamfer bit for smoothing edges, giving you everything needed for precise work. The kit works with a 5/8" arbor angle grinder and can also be adapted for use with a hand drill, provided you keep the speed above 2000 RPM and avoid impact mode. Thanks to vacuum brazed technology, the bits combine durable steel with diamonds for efficient performance and longer life, helping you complete your projects with ease.

The BRSCHNITT Diamond Core Bit is a high-quality tool designed for dry drilling holes through hard porcelain tile, ceramics, granite, marble, masonry, concrete, glass, and hard plastic. With a diamond height of 10mm and a total length of 65mm, this 1" (25mm) core drill bit is constructed with high-grade diamond grit for effortless cutting and improved durability. The special spiral groove design at the top of the bit helps with chip removal, while the wax inside the drill bit aids in cooling and lubrication. The triangle shank allows for easy attachment to any electric drill, hand drill, or bench drill. The BRSCHNITT Diamond Core Bit is the perfect choice for professionals and DIY enthusiasts looking for a reliable and efficient drilling solution.

The BRSCHNITT Diamond Core Drill Bit is a laser-welded, 1 3/8 inch bit with a diamond height of 10mm and a total length of 100mm. It boasts a 5/8-11 thread and diamond grit of #25/35, making it ideal for drilling through Granite, Marble, Hard Stone, Reinforced Concrete, Brick Block Counter Top, and more. The vacuum brazing protective layer on the surface of the core steel provides clean cuts and steel core protection. Using water while drilling could prolong the bit's lifetime while creating fast and stable drilling with no broken edges, making it suitable for use with an angle grinder.

The LEKOMESH Diamond Drill Bits set includes 11 pieces designed for efficient drilling in various materials like porcelain tile, granite, and marble. With high-quality diamond and steel construction, these bits provide fast and smooth drilling, allowing you to complete your projects more quickly. Their durability ensures a long lifespan, reducing the need for frequent replacements. Additionally, whether you choose dry or wet drilling, you can expect less chipping, giving you cleaner results. The included portable suitcase makes it easy to carry and store the bits, keeping them protected and organized.

The BETTERI Core Drill Bit offers great versatility with its two included adapters, allowing you to easily switch between regular drills and hammer drills for different tasks. Its industrial-grade design features four turbo matrix diamond segments, making the bit very sharp and durable so it can handle tough materials and last longer. You’ll also benefit from smooth and efficient drilling thanks to the precision-ground saw teeth and well-balanced design. Plus, the heat-treated steel pilot bit ensures your holes are accurately aligned every time, helping you achieve professional results with ease.