Din standard,ANSI standard,Metric sieze and imperial size

We are a specialized manufacturer of HSS twist drill bits in China and we not only provide all kinds of twist drills,such as straight shank drills,taper shank twist drills,center drills,step drills,sds drills,masonary drills,and so on,but also provide all kinds of twsit drill sets,such as normal combinations,special combinations according to your requirements,and so on.If you have any interest,please do not have any hesitation to contact us.