Flip open your Motion Pro Sag Scale II and thread the knob into the conicallocating pin through the slotted area. Please notice that there are measurementscales on both sides of the tool. The scale closest to the tip of the tool is intended for most full-size motorcycles, and the scale closest to the folding hinge isintended for most mini-bikes. Choose the scale which you intend to use, andfasten the cone on the opposite side.~ New and improved version of the original Motion Pro Folding Sag Scale~ Can be used to check front or rear sag~ New swing out design is compact and fits in most tool boxes~ Adjustable zero set point for direct scale reading (no subtracting required)~ Cone shaped axle locating pin fits hollow axles up to 20mm with repeatable precision~ 0-120mm measurement scales in 1mm increments~ Reversible multi-scale design accommodates most mini and full size motorcycles~ Made from 6061-T6 aluminum with durable blue anodized finish and laser engraved markings~ Extended length 28 3/8" (720 mm)~ Folded length 15 3/4" (400 mm)~ Designed by Motion Pro