✓
Premium True 5% Cobalt Steel
Industry grade heavy-duty drill bit set include 5% Cobalt, which increases wear-resistance and durability, perfect for precise drilling hard materials, including stainless steel, cast iron, and hardened steel.
⚡
Fast and Efficient
135° Split Point Design and Fully Ground Process for faster cutting, self-centering to prevent walk-off, and faster chip and particle removal.
📦
13 Pieces Drill Bit Set Includes
Comprehensive sizing: 1/16, 5/64, 3/32, 7/64, 1/8, 9/64, 5/32, 11/64, 3/16, 13/64, 7/32, 15/64, 1/4. Comes with an index plastic box for organized storage.
🛠️
Wide Application
Perfectly suitable for cutting through Hard Metal such as Stainless Steel, Steel, Sheet Metal and Cast Iron as well as Plastic, Aluminum Alloy, Wood and Other Softer Metals.
Warms Tips: Pay attention to speed, pressure and heat control during drilling.
High-Performance Capabilities
⚙️
Easily handle high torque and save time with adjustable bolt/nut sizing. Handles much higher loads than other tools and maintains equal force on all sides of fasteners.
🔄
One-handed operation design. Fits standard screws from 3/8 to 3/4 inch and metrics from 10mm to 19mm.
💪
Easily grips and removes damaged, rounded-off, and rusty nuts and bolts. Ideal for DIY maintenance, construction, and automotive repair.
💎
Made of premium chromium molybdenum steel with high hardness. Surface is plated and polished for rustproof durability.
Frequently Asked Questions
What materials are these cobalt drill bits suitable for?
These bits are engineered for hard metals including stainless steel, cast iron, and hardened steel, as well as softer materials like aluminum, wood, and plastic.
What is the advantage of 5% Cobalt (M35) steel?
The 5% cobalt content significantly increases heat resistance and wear-resistance, allowing the bits to stay sharp longer when drilling through tough materials.
Does the set include a storage case?
Yes, the 13-piece set comes with an indexed plastic storage box for easy organization and size identification.
What sizes does the adjustable tool cover?
It fits standard sizes from 3/8" to 3/4" and metric sizes from 10mm to 19mm nuts and bolts.
Can this tool handle rusted or damaged bolts?
Absolutely. The design is specifically optimized to grip and remove damaged, rounded-off, and rusty fasteners with ease.
What is the return policy for these tools?
We offer a 60-day refund guarantee to ensure you are completely satisfied with the premium quality and performance of our products.
Dongze Hardware
