The F4 Series levers features the same "dial adjust" reach design found on the premium CNC machined C6 series levers that allow you to adjust how far the lever is from the handlebar by simply turning an indexing dial wheel. Instantly adjust your lever reach with no tools. The ASV "Pro Model" clutch lever features an ASV Designed "Pro Model" perch that has four features not found on the "Standard" perch that comes with the standard clutch levers. (1) First and foremost it features a "true" quick adjustable cable adjuster that adjusts your clutch cable tension by simply turning an indexing star dial at the barrel. The barrel does not thread into the perch, it slides in or out when the star adjuster is turned. The star adjuster features internal springs and bearings with set screw tensioners that allow you to increase or decrease the effort required to spin the dial and the tension of the indexing detents that the spring loaded bearings fall in and out of.