✔
M35 Cobalt Steel for Durability
Made from HSS M35 with 5% cobalt, offering enhanced hardness, heat resistance, and wear, ideal for medium to hard metals like cast iron and mild steel.
✔
3-Flute Design for Faster Chip Removal
The patented 3-flute design clears chips 150% faster, reducing heat buildup and improving efficiency, especially in softer metals and alloys.
✔
Best for Tougher Metals with Proper Technique
Ideal for mild steel, cast iron, and alloys. For stainless steel (up to 3mm thick), use slow speeds and light pressure. Smaller bits perform best on materials 1-2mm thick for optimal results.
✔
Smooth & Accurate Drilling
The 135° split point reduces bit walking, allowing for quicker starts and cleaner holes in softer metals and general use.
⚙
Special Left Hand Design
Can be used with reversible drills with screw extractors to remove broken fasteners and screws, bolts, and studs for home repairs, at your automotive garage, and more.
⚙
135 Degree Split Point
Twist design to increase cutting speed with an angled tip that is a 135 degree split point for precise self-centering and designed to cut holes faster as it prevents walking, clears chips and particles faster.
⚙
Durable Material & Coating
Constructed of M2 high speed steel with a titanium nitride coating, which give it very high surface hardness to help penetrate tough materials while highly corrosion resistant reducing friction between bit and workpiece.
⚙
Complete Size Set
1/16, 5/64, 3/32, 7/64, 1/8, 9/64, 5/32, 11/64, 3/16, 13/64, 7/32, 15/64 and 1/4 inch, neatly organized in a metal case, drill indexed, easy storage.
❓
Frequently Asked Questions
What is the primary use for left-hand drill bits?
Left-hand drill bits are specifically designed for removing broken screws, bolts, and studs. When used with a reversible drill, they can help back out a damaged fastener during the drilling process.
Can these bits be used on stainless steel?
Yes, they can be used on stainless steel up to 3mm thick. It is recommended to use slow speeds and light pressure to prevent overheating and maintain the bit's life.
What are the benefits of the 135-degree split point?
The 135° split point is a self-centering design that prevents the bit from "walking" across the material surface, ensuring a precise start and faster hole cutting.
What materials are these drill bits made of?
The bits are constructed from HSS M2 or M35 Cobalt steel (depending on the specific selection) with a titanium nitride coating for superior hardness and corrosion resistance.
How does the 3-flute design improve performance?
The 3-flute design allows for chip removal that is up to 150% faster than standard bits, which significantly reduces heat buildup and improves drilling efficiency in various metals.
Are the sizes clearly marked for storage?
Yes, the set includes 13 common sizes ranging from 1/16" to 1/4", all neatly organized in a labeled metal index case for easy identification and storage.
Dongze Hardware
