RockShox Xloc Sprint Remote Lever Left for SID Upgrade Kit Includes Motion Control X DNA comp damper, rear shock hydraulic hose, bleed syringes Some of our XC racers admit to use their XLoc as often as their shifter, to gain that extra edge when sprinting XLoc is a completely sealed and dependable lockout control, which works with a single thumb press: push to unlock, push again to lock; It's that easy