THIS BUMP STOP GAUGE IS GREAT FOR GETTING THE BODY, SHAFT AND BUMP STOP HEIGHT CORRECT ON THE SHOCK. SAVES SET UP TIME WHEN HEADING TO THE TRACK OR WHEN USINGA LOAD MACHINE LIKE THE WEHRS ULTRA FORCE. 3/8" OR 1/2" OD PINS FOR MONOBALL AVAILABLE. CALL ABOUT OUR DOUBLE GAPSET GAUGE.