Geological steel pipe knowledge: geological drilling steel pipe

Geological steel pipe knowledge: Geological drilling steel pipe geological drilling steel pipe (YB235-70) is a steel pipe used by the geological department for core drilling, and can be divided into drill pipes, drill collars, core pipes, casing pipes, and sedimentation pipes according to applications.
Geological drilling steel commonly used materials: DZ40, DZ50, DZ55, DZ75 and so on.
Company's main business: thick-walled steel pipe, alloy steel pipe, straight seam steel pipe, geological steel pipe Address: No. 18, Dadong Steel City, Liaocheng Development Zone, Shandong Province Post Code: 252000
Contact person: Bu Lingwei Zhang Bing Tel: Mobile:/18266350353
company website:

Screwdriver Bit With Magnetic Coil

Rechargeable Screwdriver Set,Portable Screwdriver Set,Mechanical Screwdriver Set,Electric Magnetic Screwdriver Kit

henan horn tools co.,ltd. , http://www.horntoolsltd.com