cobalt drills also called M35 (Co 5%0 drills or M42(Co 8%) drills,
it is the best material for hss drills,normally,it used to produce fully ground drills.
it can last drill's working life more ,and increase its ground torence.
but normally,M35 drills can't drill stainless steel,but if you make it with Turbo max point,
then it can drill stainless steel.
any question or inquiry,pls feel free to contact with us YOYI person,we are with you all along.