Mollom 4-23/32" (120mm) Heavy Duty Carbide Hole Saw with 2 Pilot Bits

What it is and what it’s for

The Mollom 4-23/32" (120mm) Heavy Duty Carbide Hole Saw is a purpose-built cutting tool designed for metal and mixed-material workpieces. It combines a carbide-tipped tooth arrangement with a robust body to tackle tougher tasks that go beyond standard bi-metal hole saws. If your day-to-day involves cutting through metals like stainless steel, mild steel, iron or even harder materials such as sheet metal and certain plastics, this is positioned as a durable option in a compact size that fits common 10mm (3/8") shanks.

How it’s built and what that means in use

A standout feature is the 24 tungsten carbide teeth, selected for wear resistance and long life in demanding environments. The carbide tip makes it more capable than typical steel-toothed hole saws when faced with tougher metals. The set is designed with a spring-loaded pilot bit that ejects the cut slug, helping you finish holes faster and with less fiddling. The included pilot bits — a titanium-plated pilot and a step pilot bit — are stored within a protective plastic case for reference on site.

Materials and durability on paper

The cutter body relies on carbide-tipped cutters and titanium-plated cemented carbide teeth, which are historically associated with good hardness and corrosion resistance. The design is aimed at clearly defined metalworking tasks rather than general-purpose drilling, and the manufacturer notes that it can bore holes in up to 0.1 inch thick stainless steel under ideal conditions. This implies a constraint: performance is contingent on metal thickness, drill speed, and holding/stability.

What stands out in use

In practical terms, you’ll notice quicker cutting and a cleaner edge (less burr) when working with harder metals compared to standard bi-metal equivalents. The 25mm depth and 120mm diameter offer a sizeable reach for mechanical work, pipe and panel holes without needing a second tool. The kit is relatively compact, with each cutter in its own oil-treated wrap inside a sturdy box, which helps protect the bits and extends their usable life if you’re careful with storage.

Limitations and caveats

Not everything is flawless. The product disclaimer notes that it cannot be used for concrete, tiles or stone, which is worth noting if your job site mixes materials. The emphasis on heavy-duty metal cutting means you’ll want a stable drill setup and proper feeds to avoid overheating or premature wear. It might not be the best option if you’re drilling thinner or softer metals where a lighter cut would suffice. If you prioritise value-for-money over maximum speed, you may want to compare with lighter-duty options for smaller tasks.

What you’ll notice day to day

For daily work in metal fabrication or maintenance tasks, you’ll get a more defined, burr-free hole with faster cycle times once you dial in the drill speed and pressure. The two pilot bits add flexibility, the step bit helps locate the starting point cleanly, while the main pilot keeps alignment steady through the cut. In a practical workflow, you’ll use this for metal sheets or plate where a larger hole is required to pass fasteners or conduits.

Who it’s for

This Mollom hole saw is best suited to tradespeople and DIYers who regularly cut through metal and need a dependable, longer-life option that can handle stainless and other hard metals. It’s a practical choice for a bench drill, magnetic drill, or similar setups where you value stability, reduced burrs and a lower chance of tooth wear mid-task.

Who it isn’t for

If your tasks are mostly wood, soft plastics, or concrete tiles, there are likely better-suited tools. The material emphasis here is hard metals, for softer materials the advantage of carbide teeth may be neutralised by price and wear characteristics. It’s also not ideal if your work requires very thin-wall or ultra-fine hole dimensions where a dedicated pilot setup or a different cutting method would be preferable.

When to consider buying

• You frequently cut large-diameter holes into hard metals (stainless, iron, etc.).
• You need a robust option that can withstand repeated use on demanding projects.
• You value a long tool life and a solution that reduces burrs and slug waste.
• You’re working with equipment that supports 10mm (3/8") shanks and a 25mm cutting depth.

What to check before you buy

• Confirm your drill can handle carbide-tipped hole saws and the setup includes a suitable pilot system.
• Make sure you won’t require tile or concrete cutting, as those materials are explicitly not supported.
• Consider whether you’ll benefit from a true heavy-duty option in your toolkit or if a lighter-duty alternative would cover most tasks.

How it compares to other approaches

For metal cutting, a carbide hole saw sits between standard bi-metal options and premium stainless-steel cutting approaches. If you need large-diameter holes in hard metals occasionally, carbide cutters can offer longer life and cleaner edges, but you’ll pay a premium for the carbide tips. If your work is variable and includes softer metals or wood, you may prefer more versatile or lower-cost tools that cover a wider range of materials.

Final verdict

Is it worth it? Worth considering if your work routinely involves tough metals and you want longer tool life with cleaner results. It’s a solid pick for metalworking tasks that demand durability and precision, provided you stay within its material scope and use it with proper drill settings. If your needs are light-duty or you frequently switch between materials like concrete or tiles, you might be better off with a more versatile or lower-cost option.

Frequently asked questions

• Can I use this hole saw on aluminium without rapid wear? It should handle aluminium, but performance will depend on cutting conditions and speed.
• What drill setups pair best with this tool? A bench or magnetic drill with a stable chuck and appropriate feed rate helps maximise life and accuracy.
• How should I store these cutters to prolong life? Each cutter is oil-treated and housed in a plastic case, keep them dry and avoid contact with corrosive substances.
• Does the pilot bit affect alignment? The spring-loaded pilot helps with slug ejection and alignment, reducing the chance of wandering when starting the cut.