LAIWEI Bi-Metal Hole Saw 42 mm

If you need a circular opening rather than a smaller drilled hole, this LAIWEI bi-metal hole saw is sized for a 42 mm cut and is listed for materials including wood, PVC and thin aluminium. It can be used with a handheld electric drill or a cordless drill, while a drill stand or table drill is suggested when accuracy matters. Its spring-loaded centre drill is intended to help push chips out as you work. The main trade-off is that the listed materials and dimensions don’t tell you how deep a cut it can make, so match the job to the information available before choosing.

Best use cases

This hole cutter is intended for making round openings in drywall, plastic, wood, plywood and thin aluminium board. That makes it relevant for jobs where a defined circular cut is more useful than drilling a small pilot-sized hole. For instance, when fitting a pass-through in a plywood panel, the 42 mm size gives you a specific diameter to work with, check that it matches the opening your project requires.

The product is listed for handheld and cordless electric drills. If the hole needs to be placed accurately, the supplied guidance points to using a drill press or a drill stand rather than relying on a freehand approach. It suits you if you need this particular diameter in one of the stated materials. It isn’t for you if the work calls for a larger cut, a different diameter or a material that isn’t listed.

Product specs

• Type: Bi-metal hole saw / hole cutter
• Cut diameter: 1.65 inches (42 mm)
• Overall length: 83 mm
• Blade thickness: 1.2 mm
• Shaft diameter: 10 mm
• Centre drill diameter: 6 mm
• Blade material: M42 cobalt-containing high-speed steel (HSS)
• Centre drill material: 4341 steel

The HSS blade and centre drill are described as electron-beam welded, and the centre drill has a spring intended to help eject chips. A stated cutting depth isn’t included, though, so don’t assume the overall length tells you how thick a workpiece it can cut through. The 10 mm shaft diameter is also worth comparing with your drill’s requirements before starting.

Where it shines

A hole saw is a more suitable approach than a standard small drill bit when the job calls for a wider circular opening. The stated material range gives this one a practical role in light workshop or home projects, especially in wood, drywall, plastic and thin aluminium. What matters most for your job: a convenient handheld setup, or greater control over where the hole lands? The listing recommends a drill stand or table drill when precision is important.

Start at low speed and keep the cutter perpendicular to the workpiece, tilting it can affect the cut. For metal, the instructions call for cutting oil or water, and they also recommend wearing eye protection and gloves. Those steps matter most when working freehand, where maintaining a steady angle takes attention. This is a focused cutter, not a general-purpose answer for every material or hole size.

Final decision

Choose it when 42 mm is the required diameter and your material is among the listed options. Its spring-loaded centre drill and compatibility with handheld or cordless electric drills suit straightforward cutting tasks, while a stand can help when placement needs more control. If your project depends on a particular cutting depth, that specification isn’t provided, a cutter with a clearly stated depth rating may be a better fit.