20-Pc Diamond Drill Bit Set 1mm–2.5mm | Glass Stone Jewelry
20-Pc Diamond Drill Bit Set 1mm–2.5mm | Glass Stone Jewelry
20-Piece 120-Grit Coating Drill Bit Set – 1mm to 2.5mm
Take your crafting and jewelry-making projects to the next level with this comprehensive 20-piece rotary drill bit set. Engineered with a 120-grit diamond-style coating and a precision twist design, these bits cut through sea glass, stone, shells, porcelain, and more with smooth, accurate results every time. Made in Mainland China.
Why You'll Love This Set
- Complete Size Range: Includes 4 bits each in 1mm, 1.5mm, 2mm, and 2.5mm — so you always have the right size for pendants, pilot holes, and fine detail work.
- Water-Cooling Compatible: Designed to work with water submersion or continuous water flow, preventing overheating and cracking when drilling through thicker glass or stone materials for longer bit life.
- Precision 120-Grit Coating: The fine-grit coating on each bit delivers smooth, clean holes with minimal chipping — ideal for delicate materials like sea glass, shells, and porcelain tiles.
- Brass Collet Included: Each bit pairs with a matching brass collet that locks securely into standard rotary tools, eliminating slipping or wandering for safe, steady drilling.
- Versatile for Crafters & Hobbyists: Whether you're a jewelry maker, DIY enthusiast, or seasoned craftsperson, this set handles a wide range of projects from bead-making to stone carving.
Specifications
- Set Includes: 20 drill bits (4 × 1mm, 4 × 1.5mm, 4 × 2mm, 4 × 2.5mm) + 4 brass collet card holders
- Grit Rating: 120-grit coating
- Bit Type: Twist drill bit
- Material: Copper / brass collets
- Color: Gold
- Compatible With: Standard rotary tools
- Country of Origin: Made in Mainland China
Package Contents
- 4 × 1mm drill bits
- 4 × 1.5mm drill bits
- 4 × 2mm drill bits
- 4 × 2.5mm drill bits
- 4 × Brass collet card holders
Perfect For
Sea glass drilling, shell jewelry, stone pendants, porcelain tiles, gemstone crafts, beading, and any fine rotary tool work where precision and bit stability matter.
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Note: Actual color may vary slightly from images due to monitor brightness and lighting conditions. Please allow minor measurement tolerances.
Learn more: OSHA guidance on hand and power tools
Frequently Asked Questions
Q: What materials can these drill bits cut through?
A: These 120-grit coated rotary drill bits are designed for use on sea glass, natural stone, shells, porcelain, ceramic tiles, and similar hard, brittle materials. They are not recommended for metal or wood drilling.
Q: Do I need to use water when drilling with these bits?
A: While not mandatory for thin materials, using water submersion or a steady water drip is strongly recommended when drilling through thicker glass or stone. Water cooling prevents overheating, extends bit life, and helps produce cleaner, crack-free holes.
Q: Will these bits fit my rotary tool?
A: Yes — each drill bit comes with a matching brass collet designed to fit standard rotary tools. The collets provide a secure, stable grip to minimize vibration and keep the bit on track during use.
Q: How many bits are included and in what sizes?
A: The set contains 20 drill bits total: 4 bits each in 1mm, 1.5mm, 2mm, and 2.5mm sizes, plus 4 brass collet holders — giving you a full range of sizes for jewelry making and crafting projects.