The Slip Collar Upright adjusts to the desired height by simply adjusting the inner pipe upward.  It works on an internal ball-baring system, so as you raise the inner pipe the weight locks the upright into place.  To release, and lower back down, simply raise the inner pole to release the pressure, lift the ring and guide the inner pipe down.  Our 2″ Slip Collar Uprights pair with our Slip Fit Bases with 2″ pin.  Use and care instructions ship with this item.  Use caution when adjusting this item, if inner pipe is not held while lowering and allowed to drop, this can cause damage to the collar component.