Diamond Core Drill Bit 1 3/4 in Laser Welded Hole Saw - Fast, Durable

In this review the Diamond Core Drill Bit 1 3/4 in is assessed for stone and concrete work; the bottom line is that this bit is best for users who need a fast, clean hole in granite, marble or dense masonry without frequent blade changes. The review highlights the laser welded segments and vacuum brazing protection that together deliver stable cutting and reduced segment loss, and it explains where the bit shines and where it can be limited in heavy production use.

Key Features

• Size and fit: The 1 3/4 in (45mm) diameter with a 5/8-11 thread fits many angle grinders and core adapters for common through-holes.
• Cutting depth: The 10mm diamond height and 80mm working length let you bore substantial holes through counter tops and block without swapping tools.
• Segment construction: Laser welded segments and a vacuum brazing layer protect the steel core and reduce the risk of segment loss during aggressive drilling.
• Versatile use: Designed for dry drilling but compatible with wet cutting to extend lifetime when working through thick granite or dense concrete.
• Speed and finish: The #25/35 diamond grit balances material removal and edge quality, producing fast, smooth holes with minimal chipping.

Who It's For

This core bit is aimed at DIYers, countertop fitters and tradespeople who occasionally need reliable holes through granite, marble, reinforced concrete or masonry. Its 5/8-11 thread and 45mm size make it convenient for retrofit jobs and small installations where a clean, fast hole matters.

Those doing high-volume commercial production or drilling extremely thick slabs every day should look for heavy-duty milling cores or larger industrial bits with deeper segment heights and industrial cooling systems; the reviewed bit is better suited to intermittent to moderate use where portability and quick setup matter.

Pros & Cons

Pros

• Laser welded segments and vacuum brazing provide improved segment retention and a cleaner cut.
• Good balance of diamond grit and height for fast, smooth drilling in granite and hard stone.
• Works dry for convenience but accepts water cooling to prolong lifetime on tougher tasks.

Cons

• Mixed customer feedback on long-term durability suggests some variability in longevity under heavy use.
• Not optimized for continuous industrial production; cooling and wear management required for very thick slabs.

Specifications

Our Verdict

The 1 3/4 in laser welded diamond core bit is a practical choice for homeowners and tradespeople who need a portable, effective solution for holes in stone and masonry; it offers clean cutting and the option of wet cooling for longer life, making it good value for occasional to moderate use when proper cooling and feed technique are employed.

Frequently Asked Questions

Can this bit be used wet?
Yes, it accepts water cooling and using water will prolong the lifetime, especially when drilling thick granite.

What machines fit this thread?
The bit uses a 5/8-11 thread commonly compatible with angle grinders and standard core adapters that accept that thread size.

Is it suitable for reinforced concrete?
Yes, it is designed to work through reinforced concrete and hard stone, though heavy reinforcement or continuous industrial drilling will shorten life without proper cooling.