3/4 in Cobalt Drill Bit Set (4pcs) - M35 HSS 6in Jobber Length

In this review the reviewer examines a single-size pack of four 3/4 in cobalt drill bits aimed at users who need a heavy-duty, repeatable hole size. The bottom line: this M35 HSS kit is best for tradespeople and hobbyists who regularly drill into hardened metal and need a reliable 3/4 in option without hunting for individual bits, because the cobalt alloy and 135 degree point make it far more effective on stainless steel and cast iron than general-purpose bits.

Key Features

• Single Size 4pc Set: Provides four identical 3/4 in bits so users can keep spares and reduce downtime when a bit dulls or needs replacing.
• M35 Cobalt Construction: The M35 cobalt composition increases heat resistance and edge retention for cutting hardened metal and stainless steel.
• 135 Degree Point Tip: A split-style 135 degree point helps the bit self-center and reduces walk-off when starting holes in metal.
• Twist Design for Chip Removal: The fluted twist geometry ejects chips quickly to speed cutting and reduce clogging in deep 6 in holes.
• Jobber Length, 6 in: The longer jobber length is useful for reaching through thicker workpieces or tooling setups where extra reach is required.
• Compact Index Case: The small, sturdy storage case keeps the four large bits organized and protected between jobs.

Who It's For

This kit is ideal for machinists, metal fabricators, plumbers, and experienced DIYers who frequently drill a consistent 3/4 in hole in materials such as stainless steel, cast iron, copper, aluminum, wood and plastics and who value the durability of M35 cobalt over general-purpose HSS bits.

It is less suitable for someone who needs a range of sizes in one set or for beginners who rarely drill hardened metal; those buyers should consider a multi-size kit or starter set that covers more diameters rather than a single-size specialty pack.

Pros & Cons

Pros

• High heat resistance and cutting life from M35 cobalt suitable for tough metals.
• 135 degree point provides accurate starts and reduces bit walking on metal surfaces.
• Long 6 in jobber length offers extra reach for deep holes and awkward setups.
• Compact index case makes storage and transport straightforward on job sites.

Cons

• Single-size pack limits flexibility for users who need multiple diameters.
• Some buyers report mixed results on durability, so performance may vary with cutting speed and feed technique.

Specifications

Brand	MACXCOIP
Size	3/4 in (four pieces)
Material	M35 cobalt high speed steel
Point Angle	135 degree
Length	6 in jobber length
Case	Index storage case included

Our Verdict

For anyone who regularly drills hardened metals and needs a reliable 3/4 in option, this M35 cobalt 4pc set delivers strong cutting performance and useful reach at a reasonable value. It is a smart buy when you want durability, accurate starts, and a compact case, but those requiring varied diameters should look elsewhere.

Frequently Asked Questions

Are these bits suitable for stainless steel?
Yes. The M35 cobalt construction and 135 degree tip are designed to handle stainless steel and other hardened metals.

How deep can these bits drill effectively?
With a 6 in jobber length they are intended for deeper holes and through-drilling where extra reach is needed, though feed rate and coolant affect performance.

Does the kit include multiple sizes?
No. This package contains four identical 3/4 in bits, so it is best when that specific diameter is repeatedly required.