BlackGold Equipment LLC. Houston:281-440-5555 Midland:432-614-1168 Alberta:780-463-6425 Unbeatable Price with Superior Quality , Creditable Management in Pursuit of Excellence Distributed by BlackGoldEquip.com Quote: Quote@One-Stop-Savings.com Mechanical Drilling Jar Type JZ This mechanical drilling jar takes the appliance of mechanical structure. And high pressure will not produce in Box chamber as to create a good sealing property and greatly extend the service life. During the drilling operation, the jarring mechanism has no action due to its unique structure which cannot be controlled by the common drilling condition and torque, and its unique structure can accurately transmit the torque. Moreover, the up or down jarring blow is adjustable prior to tripping in and will not change during the downhole operation, keeping a constant jarring load. Houston:15819 Tuckerton Rd., Houston, TX 77095 Midland: 12504 Hwy 191, Midland, TX 79707 Alberta: Unit 101, 3912-77 Ave, Leduc, AB, Canada T9E0B6