All sets is popular size. It can make you only 1 drill for all kinds of different diameter hole, and it is a selfcenter. 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.

We have many size, 4-12, 6-20, 4-20, 4-30, 6-30, 4-32, 5-35, 4-39, 6-42, 4-47, 1/8-1/2, 3/16-1/2, 1/4-3/4, 3/16-7/8, 1/4-1 3/8. All size we can produce.

Spiral flute, coating we can in accordance with your request production.