Stem Lock - W9 Fender Adapter Compatible - For forks without a fender mount on lower clamps.Are you fighting your head bearings coming loose? Chances are good the OEM star nut keeps walking up the steering tube. This kit has a threaded rod that runs the full length of the steering tube bolt compressing the lower triple clamp to the upper triple clamp keeping your head bearings tight. The lower machined retaining nut has 2 5mm threads to allow you to mount a fender Includes 4 black steering tube height spacers in 20mm, 15mm, 5mm, 3mm sizes