18pcs Bi-Metal Hole Saw Set 3/4in-2-3/4in - M42 Cobalt

Our review of the 18pcs Bi-Metal Hole Saw Set finds it best suited to homeowners, tradespeople and DIYers who need a single, compact kit to cut a wide range of hole sizes in metal and softer materials. The single biggest reason to buy is the M42 bi-metal construction with 8% cobalt and a fleam ground tooth profile, which delivers faster cuts and longer life than ordinary hole saws when used on stainless, iron and alloys. The kit is practical for repetitive work because it includes multiple saw sizes, two pilot drills and a sturdy carrying case for organization.

Key Features

• M42 bi-metal construction: Provides faster cutting and improved wear resistance for drilling through hard metals and alloys.
• Turtle back tooth configuration: Offers heavy duty cutting performance so aggressive material removal stays consistent under load.
• Wide slot side design: Improves visibility while cutting and helps chip evacuation to reduce clogging in deeper cuts.
• Fleam ground teeth: Deliver smoother, quicker cuts and extend tooth life when used on stainless steel and cast iron.
• Comprehensive size range: Eleven saw blades from 3/4in to 2-3/4in mean fewer tool changes for varied installations like locks, lights and pipe passages.
• Two pilot drills and adapters: Ensure accurate starting points and compatibility with larger mandrels for reliable hole placement.

Who It's For

This set suits homeowners and light trade users who need versatile hole cutting for door hardware, LED recesses, plumbing and general workshop tasks. The included sizes cover common needs without buying single saws separately, and the M42 teeth help when cutting thin stainless and other metals.

It is less appropriate for heavy industrial production where carbide-tipped cutters or purpose-built machines are required, or for users who need depths beyond the 1-7/8in cutting depth specified for these saws.

Pros & Cons

Pros

• Good cutting accuracy and faster performance thanks to M42 cobalt teeth and fleam grinding.
• Wide range of sizes and two pilot drills provide flexibility for many projects.
• Wide slot design helps chip removal and visibility during cutting.

Cons

• Durability is mixed in user reports, so heavy continuous production use may expose wear earlier than premium industrial cutters.
• Cutting depth is limited to 1-7/8in, which may not suit thicker workpieces.

Specifications

Our Verdict

The 18pcs Bi-Metal Hole Saw Set is a solid value for DIYers and light trade users who need a versatile kit capable of cutting through metal, wood and plastics. Its M42 cobalt teeth and wide slot design make it effective for tougher materials, while the variety of sizes and included pilots reduce tool changes. For those needing industrial longevity or deeper cuts, looking at heavier duty solutions is advised.

Frequently Asked Questions

Can these saws cut stainless steel?
Yes, the M42 bi-metal composition with fleam ground teeth is designed to cut thin stainless and similar alloys effectively.

What is the maximum cutting depth?
The saws offer approximately 1-7/8in (48mm) cutting depth per blade.

Are pilot drills and adapters included?
Yes, the kit includes two pilot drills, a small mandrel, a large mandrel with adapter, and two additional adapters for fitment.