Diamond Core Drill Bit 1-3/4 in 45mm - Hardened Stone & Concrete

In this review the SHDIATOOL 1-3/4 in (45mm) diamond core drill bit is evaluated for tradespeople and serious DIYers who need a compact, hard-stone hole saw. The bottom line: it is a focused tool for cutting precise holes in granite, marble, engineered stone and masonry where a small, laser-welded core bit is required. The single biggest reason to buy is its robust laser welded diamond segment, which delivers fast cuts and reliable hole quality when used dry or, preferably, with water to extend segment life.

Key Features

• 45mm diameter: Ideal size for sink fittings, small plumbing feeds and electrical passthroughs where a neat 1-3/4 in hole is needed.
• Laser welded segments: The welded joint adds strength so the segment stays attached during aggressive drilling in hard materials.
• Dry or wet drilling: Can be used without water for convenience, but wet cutting will greatly prolong segment life and reduce dust.
• 100mm total length: Compact overall length helps control depth and works well on angle grinders and compact drills with the right adapter.
• 5/8 in-11 thread: Standard thread allows use on many angle grinders and holders, with adapters available for SDS, hex and round shanks.
• Designed for hard stone: Engineered to cut granite, marble, engineered stone, concrete and brick with good cut quality.

Who It's For

This core bit is best for countertop fitters, tile setters, plumbers and masons who routinely cut holes in granite, marble and engineered stone and need a 45mm option that mounts to an angle grinder or drill with an adapter. It is also suited to homeowners tackling precise plumbing or electrical passthroughs in stone or masonry during renovation work.

Those who should look elsewhere include contractors who need large-diameter holes or very deep core drilling, and users who expect a bit to last through heavy, continuous production work without replacing segments; feedback indicates durability can vary by workload and material.

Pros & Cons

Pros

• Fast, clean cutting through concrete and stone thanks to the diamond segments and laser welding.
• Good build quality and attachment capability with a common 5/8 in-11 thread for angle grinders.
• Works on engineered quartz and other hard stones with consistent cut quality when used properly.
• Compact 100mm length and 45mm size make it versatile for common small holes.

Cons

• Durability is mixed across users; some report limited life under heavy use, so expect replacement in production environments.

Specifications

Diameter	45mm (1-3/4 in)
Total length	100mm
Thread	5/8 in-11
Cutting method	Dry or wet drilling
Material suited for	Granite, marble, engineered stone, concrete, brick
Attachment notes	Fits angle grinder; adapters available for SDS, hex, round shank

Our Verdict

The SHDIATOOL 45mm diamond core bit is a practical, value-oriented choice for tradespeople and DIYers who need a small, reliable hole saw for hard stone and masonry. It offers strong cut quality and useful attachment options, and delivers the best value when used wet to extend segment life. Buy it if you need precise 1-3/4 in holes; those needing industrial durability or larger diameters should consider shop-grade cores.

Frequently Asked Questions

Can this bit be used wet?
Yes, it supports wet drilling and using water will greatly prolong the segment life and reduce dust.

What machines will it mount to?
The bit has a 5/8 in-11 thread suitable for many angle grinders; adapters are needed for SDS, hex or round shank drills.

Will it cut engineered quartz?
Yes, customers report it cuts engineered quartz and other hard stones effectively, though segment life depends on feed rate and cooling.