Total adjustability is what these shocks are all about. Four separate adjustments allow you to fine tune them to your exact preference of riding style and weight.  Two separate adjustments are provided for compression and rebound dampening by means of allen type screws.  The ride weight and coil spring pre-load is set with its unique threaded top collar and can be locked in place anywhere along its two inches of travel.  These shocks are also pre-filled with 110 psi of nitrogen and can be adjusted all the way down to 75 psi.  The Schrader valve is hidden under the pointed cap of the piggyback reservoir.  Both ends of the shocks and the piggy back reservoir are made from billet aluminum and are highly polished.  They are totally factory rebuildable and include instructions.  Mounting eyelets measure 1/2" I.D. and include 3 different pairs of spacers for alignment 1/16", 1/8" and 1/4".  Shock lengths are measured eye to eye.  Fits FLT 1980/Later, FXR 1982/Later, Dyna 1991/later and Sportster 1979/Later.