GREENER High Hardness Twist Drill Bit Set Stainless Steel Alloy Steel High-Speed Steel Electric Drill 4.2mm*5

Can withstand continuous drilling of up to 1500 holes without losing sharpness

Accurate positioning and smooth hole walls for professional results

Compatible with various drilling machines including electric drills, lithium battery drills, impact drills, and bench drills

Universal round shank design for secure grip and anti-slip performance

Enhanced chip evacuation for efficient and fast drilling

Resistant to impact and vibration, maintaining tight clamping without loosening

Suitable for household and industrial equipment

Shank diameter matches drill diameter for sizes above 10mm (please confirm compatibility before purchase)

(Full size chart available upon request)

Larger diameter drill bits require slower rotation speeds; please consult customer service for optimal settings

Widely used for metalworking, mold making, and general drilling applications

Multiple authoritative certifications ensuring product quality and safety

GREENER drill bits offer professional-grade performance with high hardness, durability, and precision. Their advanced design and strict quality control make them ideal for demanding drilling tasks across various materials and industries.