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The Anvil Drilling Jar is installed in any drill string to provide means to unstick a drill string should it become wedged into the formation. The increased stroke length of the Anvil provides operators with a larger impact than other available jars. The bi-directional jar action gives the operator the ability to fire the jar in the uphole or downhole directions. Accidental firing of the jar is prevented by a mechanical latch that holds the internal mandrel in place during tripping and drilling operations.