Laiwei 80mm (3.15-inch) Bi-metal Hole Saw with Heavy Duty Mandrel, HSS Cutter for Metal Pipe, Wood & Sheet Metal
Reviews
Product description
The essentials
If you need a large, fairly neat hole in things like metal pipe, sheet metal or timber, this 80mm Laiwei hole saw kit is aimed at getting you there without too much drama. It’s a bi-metal-style hole saw described as high-speed steel (HSS) with an emphasis on clean cutting and durability, paired with a heavy-duty mandrel and locking pins to help it stay stable while you drill.
On paper, the selling point here is the combination: an 80mm cutting diameter plus a mandrel that’s meant to be stronger and less prone to slipping. That matters because hole saws can be fiddly—especially when you’re trying to line up the cut and keep the tool running smoothly.
It also comes with side/relief features for chip extraction (listed as quick chip discharge and a smooth start), which should help reduce the “bogging down” feeling that some hole saws give when you’re cutting through tougher materials.
Key points
This Laiwei hole saw is designed for fast, clean hole cutting across a range of common workshop jobs: from plumbing-style pipe work to general construction, electrical maintenance, automotive-type repairs, and even sheet material where you want a straight-ish, tidy result.
The bi-metal construction approach is described as resisting oil, oxidation and heat, while also being built for wear resistance. That’s the sort of detail that’s easy to ignore when buying, but it tends to show up when you do repeated cuts or you’re working in less-than-ideal conditions.
Worth noting: the kit is only as good as your technique. Hole saws in this size category can still wander a little if you don’t start accurately, and deep drilling may call for patience even with the “no repeated drilling” claim. You’ll get the best outcome if you take it steady rather than rushing.
What you’ll notice day to day
The description focuses on a smoother drilling experience with a cleaner edge finish at speed. It also mentions “deep drilling depth” and an opening that runs more smoothly, alongside chip discharge holes to keep debris moving out.
In practical terms, that usually translates to fewer stalls and less time spent clearing out the cutting area when you’re working through a job piece. For example, if you’re fitting something to a metal pipe or cutting access through a panel, you typically want the saw to bite properly early on and keep the cut consistent—especially once the teeth are fully engaged.
One slight limitation: if your main priority is ultra-fine tolerances (a perfect press-fit finish), a hole saw can still be more about “making the opening” than achieving precision machining. For that, you’d usually need finishing tools afterwards.
Tech specs
- Name: 3.15inch (80mm) Hole Saw with Heavy Duty Mandrel
- Type: HSS bi-metal hole cutter
- Size: 80mm (3.15-inch) cutting diameter
- Mandrel: A2 mandrel (hexagonal central shaft described as robust)
- Compatibility: described as compatible with the majority of electric drills from other manufacturers
- Locking system: 2 locking pins to help strengthen the tool and reduce slipping
- Shank/connection: hexagonal central axle for power tools
What’s included & pairing considerations
You’re getting the hole saw with the heavy-duty mandrel, and the setup uses two locking pins to improve stability. The mandrel and locking approach is there to make assembly and running feel more controlled, which is particularly important on larger diameters.
Before you buy, it’s worth checking that your drill setup matches what you expect: the kit is described as using a hexagonal central axle for electric drills, and the cutting diameter is fixed at 80mm. If your project needs a different size, this won’t help.
Also consider how thick the material is on your job. The listing talks about deep drilling depth and avoiding repeated drilling, but it doesn’t provide exact thickness limits here—so you may need to adapt your approach based on the workpiece and how the cutting progresses.
Pros
- 80mm cutting diameter for making larger openings in common materials
- Bi-metal/HSS-style construction described for faster, cleaner cutting
- Two locking pins and a heavy-duty mandrel to reduce slipping
- Chip discharge features aimed at smoother cutting and less clogging
- Listed as suitable for metal pipe, wood, sheet metal and more broad workshop uses
Where it may not be the best match
It may not be a great choice if you only need small holes often, because this is specifically an 80mm cutter. It could also disappoint if you’re expecting the kind of precision finish you’d get from a dedicated machining process, hole saws are more about creating the opening than achieving final tolerance.
Is it worth it?
A solid pick if you’re regularly doing practical workshop jobs where you want a stable, heavy-duty mandrel setup and a large 80mm opening for materials like metal pipe, sheet metal and timber. It makes sense when you value clean, fast cutting “as a starting point” and you plan to reuse the tool across multiple maintenance or installation tasks.
You may want to skip it if you don’t need an 80mm diameter, if your projects demand high-precision tolerances straight from the saw, or if you’re mostly working on very thin, delicate material where you’d rather use a more specialised approach.
Mini FAQ
Common questions
Is this hole saw suitable for cutting metal pipe?
The description explicitly calls out metal pipe as one of the intended uses, alongside other materials.
Will it work with my electric drill?
It’s described as compatible with the majority of electric drills, using a robust hexagonal central shaft. If your drill uses a different chuck type, it’s best to confirm compatibility first.
Does it come with the mandrel and locking pins?
Yes—this listing includes a heavy-duty mandrel, and it specifically highlights two locking pins as part of the setup.
Will it cut clean holes?
The manufacturer description focuses on clean, smooth cutting at speed and a more precise, smoother edge. As with any hole saw, technique matters, but it’s aimed at delivering a tidier result than more basic cutters.
How do I stop the hole saw from slipping?
The kit’s two locking pins and heavy-duty mandrel are designed to strengthen the assembly and avoid slipping. Starting accurately and keeping steady pressure will also help.