We are Haixin petroleum equipment Co.Ltd based in Dongying, China. We are member of companiess.com since August, 2012. Our business is related to Industrial Machinery industry and we specifically deal in drilling equipment,drill rig, drill pipe,drill bit. Please find our product details below:drill collardrill collar are manufactured from AISI 4145H modified steel and are supplied in the "as rolled" surface finish condition.tubingsThe size of our tubings from 2 3/8 to 4 1/2, we adopt many modern technologies on our tubings to make sure the quality is the best.Thank you for taking time to go through our business profile. If there are any questions, inquiries or comments, please feel free to contact us.