30 Pcs Diamond Drill Bits Set, 1/2/2.5mm 150 Grit Diamond Tip Bits for Sea Glass Ceramic Stone Granite Jewellery Making, Compatible with Dremel Rotary Tools

• 150 Grit Diamond Coated Drill Bits for Rotary Tools: Diamond particles bonded to the metal shaft provide consistent abrasion on hard surfaces — glass, ceramic, stone, marble, quartz, and porcelain. The 150 grit coating holds its bite longer than standard grinding heads that smooth out after a few uses. Each bit maintains cutting friction through repeated drilling and engraving sessions without rapid wear
• 3mm Shank Compatible with Dremel Rotary Tools: The standard 3mm shank fits Dremel, die grinders, and most rotary tools on the UK market. Swap between bits mid-project without changing the collet — each shaft seats firmly with no wobble, keeping the bit centred and the cut line accurate. One collet size covers the full set
• Drill and Engrave Sea Glass, Ceramic, Stone, Granite, and Jewellery: Use these diamond bits to drill holes in sea glass for pendants, shape gemstone cabochons, etch designs into ceramic and glass, and grind precise channels in stone and granite. The 1mm, 2mm, and 2.5mm tip diameters cover fine detail work and broader material removal in the same kit. One set handles the full range of hard-surface tasks without switching to a different tool type
• 30 Bits in Multiple Profiles — Cylindrical, Conical, and Spherical: The set includes 30 bits across different working-end profiles and lengths. Shorter tips for tight corners and fine grooving, longer tips for deeper channels and aggressive material removal. The varied profiles mean you reach into the shape you are cutting without the bit shoulder scraping the surrounding surface
• Plastic Organiser Box with Individual Slots: Each bit sits in its own labelled slot inside the plastic storage case — no rummaging through a loose pile to find the right diameter. The case keeps the diamond coating protected during transport and storage, and the clear layout lets you spot the size you need at a glance. Compact enough to pack for off-site work alongside your rotary tool

30 Pcs Diamond Drill Bits Set — 150 Grit Diamond Tip Bits for Dremel Rotary Tools Diamond particles bonded to the metal shaft give these 150 grit bits consistent cutting friction on glass, ceramic, stone, marble, quartz, porcelain, and metal. Standard grinding heads smooth out after a few holes — diamond coating stays abrasive through repeated drilling, engraving, and shaping sessions. The 3mm shank fits Dremel rotary tools and most die grinders on the UK market without changing the collet between bits. 1mm, 2mm, and 2.5mm Tips for Sea Glass and Jewellery Making The three tip diameters cover the range most craft and repair projects need. 1mm for fine holes in sea glass pendants and delicate grooving on gemstone cabochons. 2mm for standard drilling in ceramic, glass, and soft stone. 2.5mm for broader material removal and deeper channels in granite and marble. Short tips for tight corners, longer tips for deeper cuts — the set includes both in each diameter. 30 Bits in Individual Slots Inside a Plastic Organiser Case Every bit sits in its own compartment inside the storage box — no rummaging through a loose pile of identical-looking shafts to find the 2mm one. The case keeps diamond coatings from rubbing against each other in transit and makes the right bit visible at a glance. Compact enough to pack alongside your rotary tool for off-site work. Water Coolant Extends Bit Life on Glass and Stone When drilling or grinding hard materials like glass, ceramic, or stone, apply water to the cutting surface to prevent overheating. Start at a low speed to establish the groove, then increase RPM. Let the diamond particles do the cutting — gentle pressure gives cleaner holes and longer bit life than forcing the tool into the material.