Petroleum Machinery, Fishing Tool manufacturer / supplier in China, offering Zsj/ Zxj Hydraulic Mechanical Drilling Jar Super Fishing Jar Bumper Jar Drilling Jar API Spec 7-1, API 4145h Rotary Sub Crossover Sub Joint for Oil Well Drilling Pipe Drill Collar and Kelly, Oriented Bent Sub Downhole Deflection Connection Tool and so on.