... bitThe 4y∼12 1/4 polycrystalline diamond full scale drilling bit company designed and produced by our company(shortened form PDC ... and sidetrack cut bevel bit,core bit and eccentric bit.We can design and sidetrack cut bevel bit,core bit and eccentric bit.We can design ... the same time according the user's needs.Diamond drill bit produced in our company has been sold to many oilfield ...