Thistool is designed to reset the Schlage Securekey and Kwikset Smartkey cylinders when you do not have a working key available.Consists of two combs; one on each end of the tool. These combs are used to depress the wafers inside the cylinder to a precise depth, allowing the cylinder to be rotated to the reset position.Quite simply the best and only tool capable of resetting BOTH Schlage and Kwikset user-resettable locks!