When working with fragile materials like glass, precision matters—a lot. And one of the most underrated but super important tools in this process is the diamond countersink bit for glass. Whether you're finishing drill holes on architectural glass or customizing shower doors, this tool ensures smooth, clean, and safe edges.

In this blog, we’ll explore everything you need to know about diamond countersink bits, and why factories and glass CNC workshops across the globe trust Jiangxi Jinlong New Materials Co., Ltd., a top-tier China-based supplier and manufacturer.

What Makes Diamond Countersink Bits So Special?

A diamond countersink bit is designed to chamfer and polish the edges of pre-drilled holes in glass sheets. Unlike traditional bits, it uses industrial diamond abrasives bonded to the tool’s surface to grind away material smoothly and evenly.

That’s what gives these tools their edge—literally and figuratively.

These bits are ideal for:

• Safety hole finishing

• Edge de-burring

• Glass hole chamfering

• Sink or standoff fitting holes

They come in various sizes, angles (60°, 90°, 120°), and shaft types to match your CNC machines or manual drills.

Why Is a Diamond Countersink Bit Important in Glass Processing?

Let’s face it—raw glass edges are dangerous and ugly. If you’ve drilled a hole but skipped the countersinking process, you risk:

• Edge cracking under pressure

• Poor mechanical fit

• Customer complaints about safety or aesthetics

Using a diamond countersink bit for glass helps eliminate those problems by providing:

• Chip-free hole edges

• Better stress distribution

• Increased glass durability

• Visually clean finishes

So yeah, skipping this step isn’t really an option if you care about quality.

Key Features to Look for in a Diamond Glass Countersink Bit

If you're shopping for a reliable diamond countersink bit, pay close attention to:

• Diamond grit grade – Finer grit = smoother finish

• Bond type – Electroplated and resin bonds are ideal for glass

• Tool life – High-quality bits should last through hundreds of uses

• Cooling method – Water-cooled bits reduce friction and extend life

• Shank type – Match your bit to your CNC or manual toolholder

Picking the wrong tool just ain’t worth the headache.

Why Jinlong Diamond Countersink Bits Stand Out

As a professional diamond tooling manufacturer and glass drilling tool supplier in China, Jiangxi Jinlong offers the ideal mix of performance, price, and precision. We’ve been making CNC glass tools for over 18 years, supplying OEMs and distributors across Europe, North America, and Asia.

Our diamond countersink bits provide:

• 💎 Consistent edge finishing

• 💎 High-speed CNC compatibility

• 💎 OEM customization for size, grit, and shank

• 💎 Long service life with low maintenance

And let’s not forget—our tools are made in-house and sold factory-direct, so you’re not paying for unnecessary middlemen.

How to Order the Right Diamond Countersink Bit for Glass?

We get this question a lot, so here's the quick version:

1. Know your glass thickness and hole size

2. Determine chamfer angle (90° is the most common)

3. Select your tool holder type (CNC or hand drill?)

4. Contact Jinlong with your specs—we'll handle the rest

We speak your language (both technically and professionally) and provide tailored recommendations to ensure you get the best value.

We got your back. Always.

Final Thoughts: Go Pro with Diamond Countersink Bits

A diamond countersink bit for glass is not just a tool—it’s an investment in quality, safety, and professional output. Whether you're running a small workshop or a large CNC glass factory, the right countersink solution can save time, improve finish, and boost customer satisfaction.

And with Jiangxi Jinlong New Materials Co., Ltd., you’re working with a trusted Chinese manufacturer and supplier with a proven track record.

So go ahead, upgrade your glass finishing game today.