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Product guide

GARHWAL 100mm Bi-Metal Hole Saw

GARHWAL’s 100mm Bi-Metal Hole Saw is listed for cutting circular openings in wood, plastic, drywall and thin metals. Its stated variable-pitch teeth and drill compatibility suit plumbing, conduit and general DIY work, but customer feedback flags durability and core removal as considerations.

At a glance

The listed 100mm diameter is intended for larger circular openings such as wall penetrations and vent holes.
Variable-pitch teeth are claimed to support cutting in materials including wood, plastic and metal.
The listing names bench drills, electric drills and hand drills as compatible.

Price

£8.49Save 15%

Reference price: ~~£9.99~~

Price checked: 13 Nov 2026

View offer

Often bought together

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£8.39

Hole Saw 165mm, Hole Saw with Drill Bit for Wood, Orange Bi-Metal Hole Cutter Smooth Cutting for Soft Metal, Drywall and Plastic

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Pros and cons

Pros

One listed cutter is intended for several materials, including wood, drywall, plastic and thin metal sheet.
The stated 30mm cutting depth can suit workpieces within that depth.

Cons

Customer feedback reports some drill bits snapping during use and wood becoming stuck inside the cutting disc.
Reported sharpness is mixed, so cutting performance may not feel consistent to every buyer.

Technical specifications

10 specifications

Identity and dimensions
Brand	GARHWAL
Dimensions listed	10L x 10W centimetres
Listed diameter	100mm

Materials and cutting
Material listed	High Speed Cobalt
Construction	Bi-Metal M42 alloy and HSS material
Tooth style	Variable Pitch
Item thickness	32 Millimetres
Cutting depth	30mm (1-3/16")
Compatible materials	wood, drywall, ceiling tile, plastic, tubes, mild steel sheet, thin stainless steel

Drill compatibility
Compatible devices	Bench drill, Electri drill, Hand drill

What to know before buying

Listing details to confirm

Listing details are inconsistent: the main material field says High Speed Cobalt, while other copy specifies Bi-Metal M42 alloy and HSS. The listed item thickness is 32 Millimetres, while the cutting depth is separately stated as 30mm (1-3/16"). Confirm the material description and dimensions relevant to your job.

Who is it for?

A good fit for

DIY users or tradespeople making 100mm openings in wood, plastic, drywall or listed thin metals.
Plumbers and electricians whose work involves conduit, pipe installation or wall openings, provided the material and 30mm depth match the job.

Less suited to

Buyers needing a dependable cutter for repeated heavy-duty work, given reported drill-bit breakages.
Jobs requiring a hole deeper than the stated 30mm cutting depth.

GARHWAL 100mm Bi-Metal Hole Saw · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.4 / 5 · 3,641 ratings

5 stars68%68%
4 stars19%19%
3 stars7%7%
2 stars2%2%
1 star4%4%

Customer feedback describes effective cutting across materials, including plasterboard and 25mm hardwood, and appreciates functionality and value. However, reports of drill bits snapping and wood sticking inside the cutter raise practical concerns about durability and clearing the core. Sharpness feedback is mixed. This matters particularly for repeated cuts or hardwood work, where the claimed long-life performance should not be taken as assured.

Positive themes

Customers report useful cutting performance on materials including plasterboard and 25mm hardwood.
Functionality and value for money are noted as strengths in the supplied feedback.

Negative themes

Feedback includes reports of drill bits snapping during use.
Some users report wood getting stuck inside the cutting disc.

Mixed feedback

Sharpness receives mixed feedback, with some finding it very sharp and others saying it was not sharp enough.
Quality and hole-cutter performance are described with mixed sentiment.

Frequently asked questions

What size hole does this saw cut?

The listing describes it as a 100mm hole saw. Check that this diameter suits the opening you need.

Which materials is it listed for?

The technical details list wood, drywall, ceiling tile, plastic, tubes, mild steel sheet and thin stainless steel. Other listing copy also names materials such as aluminium and copper, so confirm suitability for your specific material.

What is the stated cutting depth?

The listing gives a cutting depth of 30mm (1-3/16"). It also lists an item thickness of 32 Millimetres, which is a separate and potentially confusing measurement.

Does the package include an arbor or pilot drill?

The supplied package details do not confirm either component. Check the selected listing before purchase if you need them.