20-68mm Vacuum Brazed Diamond Core Drill Bits for Angle Grinder - Granite, Marble, Concrete & Ceramic Cutting (Hex Shank)

• Customization: Available
• Customized: Non-Customized
• Standard: API
• Length: Jobber-length
• Type: Core Drill Bit
• Material: Diamond
• Usage: Masonry Drilling, Stone
• Transport Package: Carton
• Specification: 1/4" ~ 2"
• Trademark: ODT or OEM
• Origin: China
• HS Code: 8501
• Production Capacity: 300000/Day

Product Description

Product Description

Engineered for heavy-duty stone processing, these diamond core bits feature 3.8ct/cm² vacuum-brazed diamond coating (40/50 grit) on 65Mn steel bodies. The reinforced hex shank (22.23mm) locks securely in angle grinders (100-150mm disc size), delivering 3x faster drilling than traditional hole saws. Optimized spiral grooves dissipate heat at 5000 RPM, enabling dry cutting of 20mm-thick granite in 15 seconds. Ideal for HVAC installations, plumbing, and construction projects requiring precision holes in mixed materials.

Specification

_{Key Product Features}

_{Angle Grinder Focused - 22.23mm hex shank fits 100-150mm grinders
Hybrid Cooling System - Laser-cut slots + air vents reduce temperature by 50%
Multi-Material Mastery - Single bit drills granite (Mohs 6-7), ceramic (Mohs 8), and concrete (50MPa+)
Anti-Breakage Design - 3.5mm thickened steel wall withstands 80kg lateral force
Fast Debris Clearance - 45° spiral angle expels chips 2x faster
CE/GS Certified - Meets EU power tool safety standards}

Specifications and Dimensions

Vacuum Brazed Diamond Coating
Provides superior durability and cutting efficiency, ensuring long-lasting performance.
Wide Diameter Range
Available in diameters from 20mm to 68mm, covering a wide range of drilling needs.
Compatibility with Angle Grinders
Designed to fit most standard angle grinders, ensuring easy installation and use.
Fast and Accurate Drilling
Delivers quick and precise drilling results, reducing time and effort.
Versatile Applications
Suitable for drilling in tile, rock, granite, marble, ceramic, and concrete.

Item No.	Diamond Grit Size	Threaded Interface
5mm-150mm (Customizable)	6~18mm (46#) 20mm and above (36#)	M14
This product is suitable for making holes in hard materials such as marble, concrete, granite slabs, and full porcelain tiles. It is sharp, durable, with a clean cut, and easy to use.

Drawings & Dimensions

Detailed CAD drawings and dimensional diagrams are available for download here or upon inquiry. Our engineering team can provide tailored designs to meet specific project requirements.

Why Choose Us?

Other Products

OEM/ODM capabilities
Competitive pricing & bulk discounts
Fast shipping & customs clearance support
Turnkey project solutions

Packaging & Shipping

FAQ

Q: Can it drill through 10mm thick tempered glass?
A: Yes, use water cooling and maintain 800-1200 RPM for best results.

Q: How to attach the vacuum base?
A: Press the base firmly on flat surfaces – the suction cup self-seals in 3 seconds.

Q: Is water cooling mandatory?
A: Required for glass and reinforced concrete; optional for tiles and marble.

Q: What's the diamond grit size?
A: 50/60 grit for fast cutting, 80/100 grit for smooth finishes.

Q: Compatible with hammer drills?
A: Only for rotary mode. Hammer function will damage the diamonds.