Diamond Core Drill Bit 1-1/4 in Laser Welded Hole Saw - Durable Cut

In this review the 2pc Diamond Core Drill Bit 1-1/4 in set is evaluated for tradespeople and serious DIYers who need a compact diamond hole saw for hard stone and masonry. The single biggest reason to consider this set is the combination of laser welded segments and a vacuum brazing protective layer, which together aim to deliver a clean cut and reduce segment loss during tough drilling tasks. The bits work for both dry and wet drilling, and the review focuses on real-world use, durability and the practical details that matter on job sites.

Key Features

• Size and fit: The kit includes two 1-1/4 in (32mm) cores with a 5/8-11 thread so they attach to common angle grinder adapters and give a predictable hole size for anchors or fixtures.
• Diamond segment: Diamond height of 10mm with #25/35 grit offers a balance of aggressive cutting and reasonable wear life on granite and marble.
• Construction: Laser welded segments reduce the risk of segment loss and improve stability while cutting through hard stone or reinforced concrete.
• Protective finish: A vacuum brazing protective layer on the steel core helps keep the bore cleaner and protects the steel during high-speed drilling.
• Versatility: Designed for dry drilling but compatible with wet use to prolong lifespan when cutting thick granite or dense masonry.
• Working length: The 80mm working length and 100mm total length suit shallow through-holes and countertop work without excessive overhang.

Who It's For

This set is aimed at tile setters, countertop installers and masonry contractors who need a compact diamond core for holes in granite, marble, block and reinforced concrete. The 5/8-11 thread and 32mm diameter make these bits suitable for jobs where a neat, repeatable hole is required, such as anchors, plumbing passes or fixtures.

Home DIYers tackling occasional stone work will also find value, but casual users who only need one-off large holes or require a wide range of diameters should look for a more varied kit. Those who cannot provide cooling for extended thick granite cuts should consider dedicated wet-only core systems instead.

Pros & Cons

Pros

• Laser welded segments and vacuum brazing deliver stable cutting and reduced risk of segment detachment.
• Good cutting speed on masonry and hard stone thanks to the #25/35 diamond grit and 10mm diamond height.
• Two-piece pack offers immediate backup or a spare on job sites, improving value for money.

Cons

• Designed for use with an angle grinder; users without proper adapters or water supply for thick granite may see faster wear.

Specifications

Quantity	2pcs
Diameter	1-1/4 in (32mm)
Diamond height	10mm
Total length	100mm
Working length	80mm
Thread	5/8-11
Diamond grit	#25/35

Our Verdict

For professionals and committed DIYers who work with granite, marble or masonry, this 1-1/4 in diamond core set is a sensible, value-oriented choice because of its laser welded segments and protective brazing layer that improve cut quality and durability. It is best used with an angle grinder and cooling water for extended granite cuts to maximize life and performance.

Frequently Asked Questions

Can these bits be used wet?
Yes, they can be used wet and adding water during deep cuts is recommended to prolong the lifetime of the bit.

What machines fit the thread?
The cores use a 5/8-11 thread intended for angle grinder arbor adapters and similar drill accessories that accept that thread size.

Will they cut reinforced concrete?
They are designed to cut reinforced concrete and masonry, though cooling and correct technique will extend the segment life when cutting dense materials.