Double acting accelerator jar

Downhole oil and gas well jacking tool for use with coil tubing

Downhole tool with pressure balancing

Drill string jarring and bumping tool

E-line downhole jarring tool

Field adjustable impact jar

Field adjustable impact jar

Hydraulic jar

Hydraulic jar

Hydraulic jar lock

Hydraulic jar mechanism

Hydraulic up-down well jar and method of operating same

Hydraulically driven fishing jars

Impact enhancing tool

Jar

Jar accelerator

Jar for use in a downhole toolstring

Jar mechanism

Jar mechanism accelerator

Jarring tool