Fully adjustable to fit a wide variety of applications. Cut time dramatically on jobs where the part must be registered in machine more than one time or where more than one part is to be machined. Just slide the body into the spindle of the machine, rotate the T-handle wrench which expands 3 keys which lock the body securely into position. When the chuck or collet is opened and the next piece is loaded in the machine, all distances from the stop will repeat exactly.