Hydraulic Setting Tool is a non-explosive setting tool used for installation of various downhole tools e.g. Dual Release Gun Hanger (i-Rexgun). The setting tool can be activated by either flow or setting ball. The flow rate to activate the tool can be adjusted using different compression springs. Safety mechanism prevents the tool from premature activation when meeting obstacles in the well. Setting force can be adjusted using different amount of shear screws. The tool is fully pressure balanced when running in hole.