Universal 15Pcs 1.5mm-6.5mm Hex Shank Cobalt-Alloy Twist Drill Bit Set — Specialised for Stainless Steel and Metal Drilling 9Pcs 7mm-12mm

Universal 15-Piece Hex Shank Cobalt-Alloy Twist Drill Bit Set — Specialised for Stainless Steel and Metal Drilling

Core Selling Points:
🔩 Material Advantage
Cobalt-alloy high-speed steel construction delivers exceptional hardness, high-temperature resistance, and superior wear resistance

Upgraded cobalt-alloy drill bits outperform standard titanium-coated alternatives, offering faster drilling, reduced chipping, and enhanced fracture resistance

⚙️ Design & Craftsmanship
135° CNC precision-ground cutting edge with double rear angle ensures precise positioning, eliminating the need for pilot holes and saving time and effort

Dual spiral flutes facilitate smooth chip evacuation, preventing residue build-up for accelerated drilling

Hexagonal shank design with chamfered tail end enables effortless installation and secure, slip-free clamping

🛠️ Suitable Materials
Suitable for: Stainless steel, aluminium alloy, copper, tool steel, titanium alloy, cast iron, galvanised pipe, iron and other metallic materials

Not suitable for: Plastic, wood, concrete, walls/stone, tiles, glass (strictly prohibited)

🧰 Compatible Equipment
Hand-held drills, cordless drills, dual-purpose impact drills, lithium-ion drills

Bench drills, magnetic drills, milling machines, machining centres, etc.

Retailer's note: Cordless drills offer lower RPM and torque; high-power hand drills or bench drills are recommended for optimal performance

💧 Usage Precautions
Water cooling is essential to prevent drill bit overheating and damage

Select appropriate speed and feed rate according to material

Specifications:
Diameter (mm)    Overall Length (mm)    Shank Diameter (mm)    Cutting Length (mm)    Weight (g)
1.5–12    63–133    6.2 (Universal Hex Shank)    30–90    8.7–60.5
Manual measurements may vary; actual product dimensions prevail

Resolving User Pain Points:
❌ Prone to breakage and overheating → ✅ Cobalt-alloyed hardened material for exceptional durability

❌ Insufficient hardness prevents penetration → ✅ 135° precision-ground cutting edge for rapid penetration

❌ Poor chip evacuation and jamming → ✅ Dual-spiral chip evacuation design for smooth, efficient performance

Packaging and Storage:
Conveniently packaged set, suitable for professional maintenance, machining, DIY and various other applications