M35 COBALT HSS Four Spiral Flute Cobalt Step Drill Bit 3/16″ – 1-3/8″(19 Step Size)

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M35 COBALT HSS Four Spiral Flute Cobalt Step Drill Bit 3/16″ – 1-3/8″(19 Step Size) Technical Specifications

Material Cobalt Steel
Cutting Diameter 1-3/8 Inches
Finish Type Titanium Aluminum Nitride
Shank Type 3-Flat
Cutting Angle String 135 Degrees

FOUR SPIRAL FLUTE – Four cutting blades design guarantees a faster and smoother cutting. Feels like a hot knife through butter!
TiAlN COATING – With 89HRC surface hardness, harder materials can be cut and higher cutting speeds can be achieved.
M35 COBALT HSS STEP DRILL – Prefect for 1/8″(3mm) thick Stainless Steel/Metal Sheet/Wood/Plastic/Aluminum Sheet/Copper and other metal sheets.
DIMENSION – Includes from 7/8″ to 1-3/8″. Popular Size 7/8″, 1-1/8″, 1-3/8″ labeled.
WARRANTY – If you are not fully satisfied for any reason, please contact us for 100% refund or replacement.

Handle Drilling Tasks with Ease:‌ Engineered with four razor-sharp cutting blades, our step drill bit set delivers swift, vibration-free drilling performance. The advanced geometry slices through steel, aluminum, copper and other rigid materials with surgical precision – like a hot knife through butter
Upgraded M35 Bits:‌Made from M35 cobalt high-speed steel (HSS), With its high hardness (HRC 64–66), excellent red hardness, and enhanced wear resistance for tough jobs. Our M35 cobalt steel drill bits last up to 8 times longer and drill 3 times faster than standard bits 7/8″ – 1-3/8″ Four Spiral Flute Step Drill Bit with 3/8″ Hex Shank Titanium Finish
Advanced Coating: The TiAlN coating improves surface hardness, offers reliable resistance to high-temperature oxidation, and and excellent thermal hardness, making it suitable for demanding applications
Effective Step Size: 19 step :(7/8 “, 1-1/8”, 1-3/8“),1*3/8“ Shank. When it comes to drilling hard materials, the angle of the drill tip matters. That’s why we’ve designed our drill bits with a 135° cutting angle. This angle reduces self-wear and provides a larger stress area, resulting in cleaner, more efficient drilling
Easy Organization & Identification: Our step drill bits for metal come with a handy storage case, ensuring effortless organization and portability for all your drilling tasks. Clear size markings on each bit allow for quick identification 3 Piece M35 Cobalt HSS Four Spiral Flute Step Drill Bit Set Titanium Aluminum Nitride
Widely Application: Our metal step drill bits are ideal for drilling into metal sheets, stainless steel, aluminum, copper, plastic, and other thin materials

These relatively inexpensive bits outperform very high dollar carbide machinist bits, and other much more expensive cobalt bits. The cut so fast that the material barely has any chance to get hot which makes them last forever. I’ve been using them not for several months and I am very sincerely impressed. It’s really hard to trust sellers these days. I think I paid 60 bucks to try them in my body shop just as a chance they might work on the lighter sheet metal and they performed so well and lasted so long I have started using them in my machine shop. They are suitable for cutting harder than mild steel, alloys and stainless with no issue whatsoever. I cannot speak highly enough of how surprised and utterly impressed I am with the performance. The most surprising part is the cost! They are the cheapest bits I own and they are also the best drill bits I own! I’m putting together a list to start replacing my professional machinist quality drill bits with these as they go bad and dull. They cost less than sharpening my bits and I have yet to dull any of these as of yet. Very surprised, impressed, and happy with them! I wish more things were like this. I’m happy I took a chance and bought these taking a low risk chance that had really taught me a wonderful lesson.

This bit is really rugged. It will drill through 8 inch to quarter inch solid steel on a truck steak bed. I drilled the pilot hole with an 8 inch bit and used it to make the hole up to a 3/8. This bit is extremely Sharp and extremely brittle. I advise spraying silicone on it and keep your drill moving slowly watching it peel the metal. When you’re going to that slow speed with this bit it works wonders. It’s amazing. But I usually use it for thin metal in vehicles and it has no problem whatsoever. It gets seven Stars as far as I’m concerned. But be careful it is brutal when you are drilling big holes it can hang up and snap.  Cobalt High Speed Steel Step Drill Bit 1/4″ – 2-1/2″ (15 Step Size)