This tool was specifically designed to be inserted into a lock and with the rapid pull of the trigger, activate all of the pins at once. Conventional handpicking of a lock requires the tedious job of picking one or two pins at a time. When you pull the trigger of this lock opening tool, you strike both the upper and lower pins with rapid-fire actions. Three types of stainless steel picks (two straight needles and one offset needle) and a tension wrench are included with your snap gun. 4" overall