Special steel Casing drill bit/external thread drill bit

{"cid":"157069","pid":"26043278","pimg_url":"\/\/img1.tradegrowthhub.com\/8b\/27\/abd9ff414e02\/product\/92080797_s-w400xh400.jpg","name":"energy & Mining Crown and Pilot\/Tube Drill Bit for Railroad, Foundation Base, Soft Rock and Hard Rock","attrs":{"Price":"Negotiable","MOQ":"10.0 Sets","Delivery Time":"Negotiable","Brand":"litong"}}

{"cid":"157069","pid":"26043264","pimg_url":"\/\/img1.tradegrowthhub.com\/8b\/27\/abd9ff414e02\/product\/92080841_s-w400xh400.jpg","name":"Coal ring \/tube and center drill bit used to drill grouting hole","attrs":{"Price":"Negotiable","MOQ":"20 Pieces","Delivery Time":"Negotiable","Brand":"litong"}}

{"cid":"157069","pid":"26043250","pimg_url":"\/\/img1.tradegrowthhub.com\/8b\/27\/abd9ff414e02\/product\/92080797_s-w400xh400.jpg","name":"energy & Mining Crown Drill Opener Bit And Outer Thread Connects R56 Thread \/ Casing Drill Bit For Construction Drilling","attrs":{"Price":"Negotiable","MOQ":"5.0 Pieces","Delivery Time":"Negotiable","Brand":"litong"}}