Metric HSS Hex Shank Polished Drill Bit

I. Specifications & Sizes

Metric HSS Hex Shank Polished Drill Bit Series

• Size Options: Available in individual packaging for frequently used professional sizes including 4.0mm, 4.5mm, 4.8mm, 5.0mm, 6.0mm, and 6.3mm.
• Shank Design: Standard quick-change hex shank (6.35mm) for high versatility, enabling quick and easy installation, removal, and tool switching.

II. Material Description

• Premium Material & Craftsmanship: Maruda polished drill bits are crafted from mid-grade High-Speed Steel, featuring a precision-polished metallic finish that showcases true material quality and superior wear resistance without relying on surface coatings.
• Heat & Cutting Performance: Offers excellent red hardness and cutting life, maintaining stable and smooth cutting capabilities under high-temperature and extended operation conditions.
• International Standards: Manufactured with precision in compliance with DIN international standards to ensure cutting accuracy and stability.
• Professional Practical Choice: Developed for general and precision machining, offering outstanding wear resistance and chip evacuation as an efficient and durable tool for professionals.

III. Product Features

• Application Range: Suitable for general iron sheets, alloy steels, aluminum, cast iron, wood, and plastics.
• High-Efficiency Cutting: Designed with a sharp cutting edge and smooth chip clearance, effectively boosting operational efficiency.
• Professional Endorsement: Backed by over 30 years of market presence, highly praised by professional hardware and tool stores.
• Field-Tested: Search YouTube for "STANBAL 鑽尾測試" (STANBAL Drill Bit Test) to watch real-world operation.

IV. Operation & Maintenance Guide

【Proper Usage】

• Material Compatibility: Suitable for iron sheets, alloy steels, aluminum, wood, and plastics. When drilling metal, appropriate water or cutting fluid cooling is recommended to maximize tool life.
• Tool Compatibility: Standard 6.35mm hex shank design, compatible with various quick-change chucks and power drills for fast and convenient assembly/disassembly.
• Speed Control: Adjust drill speed lower for larger hole diameters. High-speed blind drilling is strictly prohibited to prevent overheating and bit damage.

【Routine Maintenance】

• Cleaning & Protection: After use, clean out any residual metal chips and debris from the flute, wipe clean with a cloth to remove oil, sweat, or cutting fluid, and store in a dry environment.
• Regular Oiling: If left unused for an extended period, apply a thin layer of rust-preventive or lubricating oil on the metal surface to preserve material performance.
• Storage & Management: After single-piece use, it is recommended to store them properly in a moisture-proof tool box or dedicated drill rack to avoid edge damage from impacts.