M35 Four Spiral Flute Step Drill Bit Set 1/4ft - 1-3/8ft - High

In this review the M35 Four Spiral Flute Step Drill Bit Set stands out as a heavy-duty step bit kit for metalworkers and hobbyists who need one tool to cut a wide range of hole sizes. The bottom line: it is built from M35 cobalt high speed steel with a four-cutting-blade design and TiAlN coating, so it handles stainless steel, aluminum, wood and plastic more cleanly than typical step bits. For anyone who regularly drills different diameters without swapping bits, this set saves time and maintains edge life under tougher loads.

Key Features

• M35 Cobalt Construction: The cobalt-enhanced high speed steel offers higher wear resistance and heat tolerance so edges stay sharp longer when cutting metal.
• Four Spiral Groove Design: Four cutting blades and spiral flutes clear chips faster, producing smoother holes and reducing clogging on metal and plastic.
• Wide Size Range: Nineteen stepped sizes from 1/4' up to 1-3/8' let one bit create multiple hole diameters without changing tools, speeding common tasks.
• TiAlN Coating: The industrial grade TiAlN coating increases hardness and thermal resistance, improving performance during prolonged or high-temperature drilling.
• 1/4' Hex Shank: The hex shank fits common drill chucks and quick-change drivers for secure grip and simple use.
• Warranty Support: The seller offers a clear warranty policy with responsive customer support and replacement or refund if the hex handle breaks.

Who It's For

The set is ideal for metalworkers, electricians, and cabinet makers who need to punch multiple hole sizes through thinner sheet metals, aluminum panels, or plastics without swapping bits. It also suits DIYers who want a single durable bit to handle occasional stainless steel and wood tasks.

It is less suited to heavy plate work beyond the step height or users who need precision reamed holes; for thick structural steel or precision holemaking a specialized cutter or reamer is a better choice.

Pros & Cons

Pros

• High wear resistance from M35 cobalt steel keeps the cutting edge sharp under tougher metal cutting.
• Four-blade spiral design and TiAlN coating deliver smoother cuts and improved heat resistance for longer life.
• Wide range of 19 step sizes eliminates frequent bit changes and speeds common drilling tasks.
• Solid fit and compatibility with standard 1/4' hex chucks make it easy to use in most drills.

Cons

• Step height limits the thickness of material for some sizes, so it is not ideal for drilling very thick plates.
• As with any step bit, hole finish can vary with feed rate and material, so technique affects results.

Specifications

Our Verdict

The M35 Four Spiral Flute Step Drill Bit Set is a practical, durable choice for tradespeople and serious DIYers who need a versatile bit that stands up to harder metals. Its cobalt construction and TiAlN coating justify the purchase for frequent use because the bits stay sharp and cut cleaner, making the set good value for those who drill multiple diameters in sheet materials.

Frequently Asked Questions

Can this drill bit cut stainless steel?
Yes, the M35 cobalt composition and TiAlN coating are designed to cut stainless steel and other harder metals when used with appropriate speed and cooling.

What materials should not exceed the step height?
Thicker plates that exceed the height of the step should be avoided; the bits work best on sheet metal, thin aluminum, wood, and plastic panels thinner than the step profile.

Will the 1/4' hex shank fit my drill?
The 1/4' hex shank is compatible with standard hex chucks and quick-change adapters, providing a secure fit in most drills.