Cone-shaped axle locating pin fits hollow axles up to 20 mm with repeatable precisionAdjustable zero-set point for direct scale reading (no subtracting required)Can be used to check front or rear sag on mini and full size motorcyclesSwing-out design is compact and fits in most tool boxes0-120 mm measurement scales in 1 mm incrementsLaser engraved markingsExtended length 28-3/8''Folded length 15-3/4''