"Based on domestic market and expand overseas business" is our improvement strategy for Tester, 8 Inch Drilling Jar , Casing Swage , Drilling Stabilizer Gauge , Our monthly output is more than 5000pcs. We have set up a strict quality control system. Please feel free to contact us for further information. We hope that we can establish long-term business relationships with you and carry out business on a mutually beneficial basis. We are and will be always trying our best to serve you.