our step drill is the newest design with spria flute.It make the products have better quality and a long life and make the drills sharp than other products.
All sets is popular size.It can make you only 1 drills for all kinds of different diameter hole,and it is a self-center.Our products have best quality HSS in China.And vacuum heat treatment.Make the cutter clear and have a stable intensity.
And we also supply our customer with Triangle shank,make the drill have more power.