Kenjer is exclusively in the business of manufacturing, selling, renting and servicing bi-directional hydraulic down-hole jars and impact-r's. Our products are used around the world where reliability and predictable jarring hits are demanded. Highlights of the tool: Fully adjustable impacts by varying loads; easily bi-directional/single direction; one of the shortest jars on the market; high rotational torque; fishing/open hole/ re-entry and custom timing for multiple applications. We stock sizes from (1-11/16" - 3-1/8" OD).