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How to identify the quality of hss step drill bits
[ Published:2019/5/28  Read:358 times  Source:tenyu]

PREMIUM MATERIAL
Classic HSS construction for capability and durability, also ensures a longer service life so that the drill bits last through multiple uses. 

HIGH EFFICELNCY
Professional HSS Step Drill design for precision drilling different size holes from 5mm up to 65mm in diameter,optimum speed and accuracy.you can achieve one-time processing of large holes, no need to replace the drill bit and positioning hole. 


LESERED SIZES
Sizes are laser etched into the metal so they will not wear out even after repeated use, make precise drilling easy. 

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