Cobalt-Coated M2 HSS Metric Straight Shank Drill Bit Set - 19 & 25-Piece with Storage Case

I. Model Specifications

        M35 Cobalt Straight Shank Series (Standard Type)

• Metric Sizes: 0.5mm to 13.0mm (Graduated in increments of 0.1mm, full range available).
• Inch Sizes: 1/16" to 1/2" (Complete range of common sizes).
  
• Packaging Options:
  • 19-Piece Set Contents: 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.0, 8.5, 9.0, 9.5, 10.0 mm
  • 25-Piece Set Contents: 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.0, 8.5, 9.0, 9.5, 10.0, 10.5, 11.0, 11.5, 12.0, 12.5, 13.0 mm

II. Material Description

• Genuine M35 Cobalt Steel: Stanbal cobalt drill bits are entirely crafted from industrial-grade M35 High-Speed Steel (HSS), alloyed with 5% cobalt (Cobalt).
  
• Advanced Hardness and Heat Resistance: While industrial-grade M2 high-speed steel already offers outstanding cutting performance, M35 cobalt steel takes hardness and red hardness (high-temperature resistance) to the extreme. Through rigorous precision overall heat treatment, the 5% cobalt content significantly enhances the steel's heat and wear resistance, preventing it from softening due to annealing even under continuous high-temperature drilling, thereby extending tool lifespan.
  
• International Standards: Strictly manufactured in compliance with DIN international standard size specifications to ensure exceptional precision and high cutting stability during every operation.
  
• Specially Designed for Super-Hard & Difficult-to-Cut Materials: Featuring industrial-grade alloys and an optimized 118-degree split point design, it is tailored for high-strength applications and high-hardness metal objects. It provides precise centering without slipping, exceptionally fast cutting speeds, and minimal tolerances, greatly boosting production line efficiency.
  

III. Product Features

• Genuine M35 Cobalt Steel: Contains 5% cobalt, providing superior high-temperature resistance and anti-wear capabilities. Even after multiple re-sharpenings, it maintains its original robust cutting power for a long time.
  
• High-Efficiency Flute Design: Unique double-helix polished flute design with optimized angles ensures smooth and fluid chip evacuation without clogging, effectively preventing drill bit overheating, snapping, or damage to precious workpieces.
  
• Professional Endorsement & Brand Equivalency: With over 30 years of cultivation in the hardware tool market, it is widely acclaimed by professional hardware stores and tool shops.
  
• Proven Performance: Please search for "STANBAL stainless steel drill bit test" on YouTube to watch the impressive actual stainless steel penetration performance.
  

IV. Usage and Maintenance Guide

[Proper Usage]

• Material Compatibility: This product is suitable for stainless steel (SUS304/316), high carbon steel, mold steel, titanium alloy, cast iron, as well as alloy steel, aluminum alloy, wood, and plastics. When drilling high-hardness materials (such as stainless steel), be sure to use adequate water or cutting fluid for cooling to extend tool life.
  
• Machine Matching: Designed with a round straight shank, suitable for standard three-jaw chucks on various hand drills, bench drills (drill presses), or lathes. If you intend to use them with quick-change impact drills, please refer to the "Hex Shank Series" in our store.
  
• Speed Control: The larger the drill hole diameter, the slower the drill speed should be. High-speed blind drilling is strictly prohibited to avoid drill bit overheating and damage. When drilling stainless steel, always adopt the proper technique of "low speed, heavy pressure".
  

[Daily Maintenance]

• Cleaning and Protection: After use, clear remaining chips and debris from the flutes, wipe off oil, sweat, or cutting fluid with a clean cloth, and store in a dry environment.
  
• Regular Oiling: If left unused for an extended period, apply a thin layer of anti-rust or lubricating oil to the metal surface to preserve material performance.
  
• Storage Management: After using individual bits, it is recommended to store them properly in a moisture-proof tool box or dedicated drill bit holder to avoid edge damage caused by collisions.