NEO TOOLS HSS-Co 10.5 mm Cobalt Twist Drill Bits, 5-Pack

Professional workshops and demanding DIYers rely on the NEO TOOLS HSS-Co 10.5 mm cobalt twist drill bits when working with tough alloyed steels, stainless steel, or cast iron. This 5-piece set delivers clean, accurate holes in metal with reduced risk of bit breakage, thanks to 5% cobalt alloyed high-speed steel and a fully ground 135° split point that bites instantly without wandering.

Key specifications

• Drill bit type: Twist drill bit, right-hand cut
• Material: HSS-Co (high-speed steel with 5% cobalt)
• Diameter: 10.5 mm, tolerance h8
• Total length: 133 mm; working length: 94 mm
• Point angle: 135°, fully ground
• Shank: Cylindrical, DIN 338 standard
• Surface finish: Bright
• Packaging: Plastic case, 5 pieces

Why choose it

Cobalt alloying significantly increases heat resistance and hardness compared to standard HSS, allowing these bits to maintain sharpness longer when drilling stainless steel or high-strength alloys. The 135° split point reduces thrust pressure and prevents walking, making hole positioning more precise. Fully ground flutes ensure efficient chip evacuation, reducing friction and heat build-up for longer tool life.

Ideal use cases

• Drilling alloyed and unalloyed steel in fabrication shops
• Creating precise holes in stainless steel for food-grade equipment
• Working with cast iron components in automotive repair
• Drilling non-ferrous metals such as aluminium and brass
• General metalworking tasks in maintenance and construction

Good to know

These bits are manufactured to DIN 338, ensuring consistent quality and compatibility with standard drill chucks. The plastic case keeps the 5 bits organised and protected. For best results, use cutting fluid when drilling hard metals and reduce speed as diameter increases. The bright finish offers a clean surface that resists corrosion in normal storage conditions.