Best Diamond 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 DKIBBITH Diamond Drill Bits set offers seven dry diamond bits plus a masonry bit, giving you a full range of sizes for various projects. These bits come with a built-in wax lubricant that melts during drilling, helping to keep the bit cool and extend its life. You can drill clean, precise holes in tiles, porcelain, granite, ceramic, and more thanks to the vacuum brazed diamond technology. The round shank design fits most electric drills and grinders, while side flutes help clear debris quickly, making your work faster and smoother. Plus, depth marks help you control hole depth for accurate results.

The Buenoarte Diamond Grinder Bits offer a reliable set of tools designed for working with stained glass and other hard materials like ceramic tiles and stone. These bits feature a brass core that helps prevent sticking and reduces shaft binding, making your grinding smoother and more efficient. Their diamond-coated surfaces are double plated for extra strength and durability, ensuring a longer tool life. You’ll find four different sizes included, providing versatility for various DIY projects and precise shaping tasks. Plus, these bits are compatible with most glass grinders and work best when used with water or coolant, helping you achieve professional results with ease.

SALI Core Drill 2" is a versatile tool designed for drilling concrete, brick, masonry, and more. The package includes essential adapters for different drills. With a 10" drilling depth and turbo laser-welded segments, it ensures efficient and smooth drilling. The simple operation allows you to start drilling vertically, making your task easier. The premium components and high-quality diamond grits provide a longer coring life, ensuring durability and precision.

The Yauende Diamond Drill Bits are designed to help you drill precise and clean holes in delicate materials like glass, porcelain, and marble, minimizing the chance of cracks or damage. These bits are built to last and work efficiently, so you can complete your drilling tasks faster and with less effort. The set includes multiple sizes, giving you the right bit for a variety of materials such as granite, quartz, ceramic, and acrylic. Plus, their round shank design fits most power drills, making these bits a great choice whether you're a DIY enthusiast or a professional craftsman.

The DECKRKAT Diamond Drill Set offers a versatile collection of seven drill bits in various sizes, suitable for drilling through tile, ceramic, glass, marble, granite, and masonry. This set includes a special 1/4" masonry bit, giving you flexibility for different materials. Its dry drilling technology uses a wax lubricant and built-in cooling system to keep the bits from overheating and wearing out quickly, helping you work longer without interruptions. The vacuum brazed diamond tips ensure precise, clean holes, while the side flute design removes debris efficiently, keeping your drill site tidy and accurate. Plus, the round shank fits most standard drills, making it easy to use with your existing tools.

The Stained Glass Diamond Grinder Bit Head Tools include 4 pieces of diamond grinding bits in 4 sizes with 4 matching Allen wrenches, suitable for grinding and drilling hard materials such as ceramic tiles, glass, colored glass, and stone, and work well for glass grinders of most brands. Featuring a standard frosted design, brass core, and double-plated diamond abrasive bonding surface, the tools are durable and efficient, making them a practical and necessary addition to your toolbox.

The REKCKRUL Diamond Drill Bits are designed with industrial-grade diamond particles and advanced vacuum brazing to ensure they last longer and resist heat better. This means you can work on tough materials like ceramic, glass, and granite without worrying about quick wear. These bits are great for both dry and wet drilling, giving you the option to add water for cooler operation and extended tool life, or to drill dry for convenience. The 1/4-inch hex shank fits securely into your drill, preventing slipping and wobbling, so you can drill precisely and efficiently at high speeds. Plus, the set includes five sizes, making it versatile for various projects from small crafts to big renovations.

Introducing the YUANYUU Diamond Chamfer Bits, the perfect tool for enlarging, shaping, and trimming existing holes in ceramics, hard ceramics, granite, and marble. This set includes two different shaped diamond router bits with a threaded adapter, allowing you to easily polish the hole. With the diamond cone grinder bit and diamond milling drill bit, you can create holes of different sizes without the need for multiple core drills, saving you time and effort. Made of high-quality diamond and sturdy metal materials, these chamfer bits ensure safety, reliability, and high hardness for effective cleaning and trimming, resulting in smooth and beautiful hole finishes. Whether you need to enlarge a hole or create circular indentations for pipes or wires, the YUANYUU Diamond Chamfer Bits have got you covered.

SHDIATOOL Core Drill Bits are vacuum brazed diamond drill bits designed for dry/wet drilling on porcelain ceramic tile, marble, stone, masonry, and brick. With a diameter of 1-3/8 inch and a diamond height of 15mm, these drill bits are compatible with angle grinders and have a total height of 75mm. The maximum working depth is 50mm. The high-quality diamond grain ensures fast and smooth drilling, making these drill bits a convenient tool for your drilling needs.