Diamond Drill Bits for Glass, 24-Piece 1mm to 2.5mm, Dremel Fit Review
A 24-bit diamond set with four brass collets that fits rotary tools out of the box for glass and stone jewelry work.
| Bits | 24 diamond |
|---|---|
| Collets | 4 brass |
| Sizes | 1, 1.5, 2, 2.5mm |
| Shank | 1/8 in |
| Coating | Diamond |
| Fits | Dremel, flex shaft |
| Best for | beginners and volume makers drilling sea glass |
Product Overview
This 24-piece diamond drill bit kit grinds holes in glass, stone, and ceramic, and ships with four brass collets so bits fit your rotary tool right away. It suits beginners trying sea glass and makers producing jewelry in volume. Four sizes from 1mm to 2.5mm cover the most-used jewelry range.
Each bit uses a 1/8 inch shank that works with most rotary tools, flex shafts, and hobby drills. Diamond-coated tips grind sea glass, shells, gemstones, ceramic, and stone while reducing breakage. The included collets aim to give a secure, stable fit without extra purchases.
Score Breakdown
This verdict is based on the manufacturer's stated specifications, the current Amazon listing and its product images, the confirmed materials and design, real buyer ratings, and our research into the product category. Scores are consistent editorial judgments, not laboratory measurements, and we did not receive a paid sample.
Key Features
Includes 24 bits and 4 brass collets so they fit right out of the box.
Covers 1mm, 1.5mm, 2mm, and 2.5mm for common small holes.
Grinds glass, shells, gemstones, ceramic, and stone with less breakage.
A 1/8 inch shank fits most rotary tools, flex shafts, and hobby drills.
Twenty-four bits give backups for high-volume making.
Design and Build Quality
The kit pairs 24 diamond bits with four brass collets. That combination is the selling point: the collets ensure bits seat properly in the rotary tool out of the box, so there is no guessing or hunting for parts before you drill.
Diamond-coated tips do the work, grinding fragile material rather than cutting it. The maker says this grinds clean holes in sea glass, shells, gemstones, ceramic, and stone while reducing breakage on delicate pieces. The coating is the wearing part of each bit.
Sizes cover 1mm, 1.5mm, 2mm, and 2.5mm, described as the most-used jewelry sizes for earrings, pendants, jump rings, and small craft holes. Each bit uses a 1/8 inch shank that fits most rotary tools, flex shafts, and hobby drills.
Performance in Everyday Use
For jewelry makers, the value is drilling holes in brittle material without cracking it. The diamond tips grind sea glass and stone cleanly, and the four sizes cover typical bead and pendant holes. Twenty-four bits give backups so high-volume work keeps moving.
The included collets matter in practice. Many rotary tools need the right collet to hold small shanks tightly, and bundling four removes that hurdle. A secure fit steadies the bit, which helps with precise, chip-free holes on small pieces.
Honest limits apply. Diamond bits are consumable and dull with use, so this is a working supply, not a lifetime set. Glass and stone drill slowly and, as with all diamond bits, benefit from water cooling. These points come from the listing, not testing.
How It Performs: The Evidence
| Decision factor | What we found | Evidence and measurement | Score | Why it matters |
|---|---|---|---|---|
| Bits plus collets | Includes 24 bits and 4 brass | Maker stated | 8.4 | Includes 24 bits and 4 b |
| Four jewelry sizes | Covers 1mm, 1.5mm, 2mm, and | Maker stated | 8.4 | Covers 1mm, 1.5mm, 2mm, |
| Diamond tips | Grinds glass, shells, gemsto | Maker stated | 8.4 | Grinds glass, shells, ge |
| Rotary compatible | A 1/8 inch shank fits most r | Maker stated | 8.4 | A 1/8 inch shank fits mo |
| Volume-ready set | Twenty-four bits give backup | Maker stated | 8.4 | Twenty-four bits give ba |
Who Should Buy It
- Sea glass jewelry beginners
- High-volume jewelry makers
- Earring and pendant holes
- Shell and gemstone drilling
- Ceramic and stone crafts
- fast drilling of thick, hard stone
- Diamond tips wear over time
- Hard material grinds slowly
- Water cooling still recommended
- Specs are maker-stated, not lab-tested
Full Specifications
How It Compares
| Feature | Generic | Typical budget | Premium option |
|---|---|---|---|
| Bits | 24 diamond | Basic | Better |
| Collets | 4 brass | Basic | Better |
| Sizes | 1, 1.5, 2, 2.5mm | Basic | Better |
| Shank | 1/8 in | Basic | Better |
Alternatives Worth a Look
For anyone starting sea glass jewelry or drilling in volume, this 24-piece kit stands out for bundling four brass collets. That solves the common headache of bits not seating in a rotary tool, so you drill straight away. Four sizes from 1mm to 2.5mm cover the everyday jewelry range, and 24 bits give plenty of backups. Diamond tips grind glass, shells, gemstones, ceramic, and stone while reducing breakage. The trade-offs are the usual ones for diamond bits: the coating wears, so they are consumable, and hard material grinds slowly. Following standard water-cooling practice protects both bits and workpieces. As a ready-to-use starter and volume kit, it looks well thought out. Specs are maker-stated, not tested.
Frequently Asked Questions
Why does this kit include brass collets
Many rotary tools need the correct collet to grip small bit shanks tightly. The maker bundles four brass collets so the 24 bits seat securely right out of the box. That removes the guesswork and extra purchases, letting you start drilling immediately with a stable fit.
What sizes come in the 24-piece set
The kit includes 1mm, 1.5mm, 2mm, and 2.5mm bits, described as the most-used jewelry sizes. These suit earrings, pendants, jump rings, and small craft holes. Having a spread of sizes plus backups helps across different bead and finding requirements.
What can these diamond bits drill
The maker lists sea glass, shells, gemstones, ceramic, and stone. Diamond-coated tips grind these hard, brittle materials rather than cutting, which reduces breakage. The kit is aimed at jewelry and craft work, so soft materials such as wood fall outside its intended use.
Do these bits fit a Dremel tool
Each bit uses a 1/8 inch shank that the maker says fits most rotary tools, flex shafts, and hobby drills, including Dremel. The included brass collets help secure the shank for a stable fit, so the kit works with common hobby setups without extra parts.
How do you make the bits last longer
As with all diamond bits, using water to cool the tip and clear grit helps. Light pressure and a steady pace reduce heat and chipping on fragile pieces. Diamond coating is consumable, so the 24-bit count gives backups when tips eventually dull with use.
This review draws on the maker's stated features and the product listing. Details such as the 1mm to 2.5mm sizes, the 24 bits and four brass collets, the 1/8 inch shank, and Dremel compatibility are as described by the seller, not independently lab-tested. Any score is an editorial judgment based on the described design, not a measured result.