Diamond Core Drill Bit 1-1/2 in Laser Welded Hole Saw - Fast, Clean

Our review of this 1-1/2 in diamond core drill bit finds it best suited for tradespeople and DIYers who need a compact bit that cuts clean holes through hard stone. The single biggest reason to buy is its laser welded construction and vacuum brazing layer, which together produce stable drilling and help protect the steel core during use. Tested on masonry and stone, it handles short, precise cuts well and performs noticeably better when used with water for cooling.

Key Features

• Size and fit: The 1-1/2 in diameter and 5/8-11 thread make it easy to attach to common angle grinder adapters for compact hole drilling in stone and block.
• Cutting depth: Ten millimeter diamond height and an 80 mm working length provide a usable cutting segment for most countertop and masonry passes.
• Laser welded segments: Laser welded technology secures the diamond segments to reduce the chance of segment loss and keeps performance consistent during a run of holes.
• Protective coating: The vacuum brazing protective layer on the steel core helps achieve cleaner edges and resists premature steel wear during dry or wet drilling.
• Versatile application: Designed for granite, marble, reinforced concrete and brick, it is suitable for tasks from small countertop holes to masonry penetrations when used properly.
• Dry or wet use: The bit can be used dry for convenience, but adding water prolongs life and reduces heat on thick stone.

Who It's For

This diamond core bit is aimed at professionals and experienced DIYers who need a compact 38 mm hole saw for stone, tile, or block work. It fits common angle grinder setups and is handy for cutting through granite and marble for sinks, tap holes, or light plumbing penetrations.

It is less appropriate for contractors who must cut very large volumes of deep holes daily or for users who expect extremely long life under continuous heavy load; in those situations a larger industrial core system or longer duty bits would be a better choice.

Pros & Cons

Pros

• Laser welded segments and vacuum brazing deliver stable cutting and help prevent segment loss.
• Fast and smooth drilling with generally clean cut edges when used correctly.
• Compact 1-1/2 in size with 5/8-11 thread fits common power tools for flexible use.
• Works in dry or wet conditions, and cooling with water noticeably extends life.

Cons

• Mixed customer feedback on durability suggests performance can vary by material and technique.
• Not intended for high-volume deep coring jobs where industrial bits perform better.

Specifications

Our Verdict

This 1-1/2 in diamond core drill bit is a sensible value for stone and masonry tasks where a compact, reliable hole saw is required. Its laser welded segments and protective brazing give clean cuts for countertop and block work, and users who cool the bit with water will see the best life. Buy it if you need a small, practical core bit for occasional to moderate stone work; look elsewhere for heavy industrial coring.

Frequently Asked Questions

Can this bit be used wet?
Yes, it supports wet drilling and using water will reduce heat and extend the bit life.

What tool does it attach to?
The bit uses a 5/8-11 thread and is commonly fitted to angle grinder adaptors or compatible drill arbors.

Will it cut reinforced concrete?
Yes, it is designed to cut granite, marble, reinforced concrete, brick and similar hard materials, though heavy rebar may affect durability.