1 Company information: Corider, with advanced lathe equipment and CNC machining center , has its own experienced technical experts, mainly produce tricone bits and PDC , and also HDD hole openers. With large stock, fast delivery can be made any time as your requirement. 2 Product Specifications & Photos 1> 4 1/4" PDC drag bits 2> with 2 3/8 API reg pin 3> suitable for soft to medium hard sandstone and shale 4> meet with API standard 5> with ISO certificate 3 Advantages: 1> with lowest price among the drilling bits 2> with short delivery time 3> your wise choice especially drilling in soft formations. Our Services