3 PCS Cobalt M35 Step Drill Bits Set 1/8in to 7/8in - Durable TiAlN

In this review of the 3 PCS Cobalt M35 Step Drill Bits Set, the bottom line is simple: this set is for anyone who needs a compact, reliable way to drill multiple hole sizes in sheet materials without switching bits. The biggest reason to buy is the combination of 5% cobalt M35 HSS construction and TiAlN coating, which together deliver tougher edges and longer life when working with stainless steel and other metals. The reviewer found the bits cut cleanly, self-center with the 118 split point tip, and handled rapid chip evacuation thanks to the 4 spiral flute design.

Key Features

• M35 HSS with TiAlN: The 5% cobalt high speed steel core with a TiAlN coating increases edge life and heat resistance when drilling stainless steel and other hard materials.
• 4 Spiral Flute: The four-flute geometry clears chips faster and produces smoother cuts, reducing clogging when stepping through multiple hole sizes.
• 118 Split Point Tip: The sharpened split point self-centers without walking, making it easier to start holes on thin or slippery sheet metal.
• Three-Step Bits 1/8in to 7/8in: Each bit covers a wide range of sizes so the user can drill many diameters with just three tools, saving time and chuck changes.
• Wide Material Compatibility: Suitable for stainless steel, aluminum, plastic, iron and copper sheet, giving versatility for workshops and maintenance tasks.

Who It's For

This set suits fabricators, metalworkers, electricians, plumbers and DIYers who need to punch accurate holes through sheet metal and plastics without carrying a large selection of individual bits. The durability of M35 HSS with TiAlN coating means it is particularly relevant for those who frequently drill stainless steel and other tougher alloys.

Those who should look elsewhere include users who need fractional accuracy to tight tolerances for finished-bore assemblies or who regularly drill very large holes beyond 7/8in, since these step bits are intended for fast, incremental hole sizing rather than precision reaming or full-size hole saw work.

Pros & Cons

Pros

• Durable M35 HSS with TiAlN provides longer life when cutting harder metals.
• Four-flute design and split point tip give faster starts and cleaner cuts with reduced walking.
• Three bits covering 1/8in to 7/8in minimize tool changes and work well across common sheet thicknesses.
• Versatile application across stainless steel, aluminum, plastic and other sheet materials.

Cons

• Some users report the bits can dull or fail under very heavy continuous use on thick hardened steel, so they are not indestructible.
• The stepped profile is not intended for precision finishing to exact tolerances required by some fabricated assemblies.

Specifications

Material	M35 high speed steel with 5% cobalt
Coating	TiAlN
Tip	118 degree split point
Flutes	4 spiral flute
Size Range	1/8in to 7/8in (multiple step sizes per bit)
Piece Count	3 step drill bits

Our Verdict

The 3 PCS Cobalt M35 Step Drill Bits Set is a practical, value-packed choice for tradespeople and serious DIYers who drill sheet metal regularly. Its combination of M35 HSS and TiAlN coating delivers measurable durability and faster cutting with reduced walking, while the three-bit coverage simplifies jobs that require many hole sizes. Buyers seeking durable multi-size step bits for stainless and other common sheets will find good value here.

Frequently Asked Questions

Can these drill through stainless steel?
Yes, the M35 cobalt HSS body and TiAlN coating are designed to handle stainless steel and other harder sheet metals.

What size range do the bits cover?
The three included step bits cover holes from 1/8in up to 7/8in across multiple stepped increments.

Will they prevent walking when starting a hole?
The 118 split point tip is self-centering and helps reduce walking on thin sheets and slippery surfaces.