a device for latching onto a down hole object located within a well bore is claimed . the device will include a mandrel connected to a work string and with an end adapted to engage the object . the device also includes a biasing member disposed about the mandrel ; and , a collet member operatively disposed about the mandrel . the collet member will have a first end adapted to cooperate with the biasing member and a second end that contains an engaging member , operatively associated with the second end of the mandrel , for engaging the object . the mandrel and the collet member cooperate to form a chamber . the device will also include a locking member , contained within the chamber , for locking the mandrel and collet member together so that the mandrel and collet member act as one member . the locking member includes : a detent member ; a housing member containing the detent member ; a piston , adapted for containment within the chamber , for activating the locking member ; and , a groove on the mandrel that cooperates with the detent member . the device may further comprise an activation port , associated with the mandrel , for activating the piston so that the housing member holds the detent member within the groove . the work string may be attached to a drill string , coiled tubing string or other work string . the object may be a stuck down hole tool , a down hole packer means , or some other type of apparatus used in the drilling , completion , and / or production of wells . also disclosed is a method of engaging a down hole object with the spear device .