For use on WP AER48 inverted forks with one each M4 x 0.7 and M8 x 1.0 air bleed screws in the fork caps New ultra-compact, low profile design is only 11 mm high installed Stainless steel body is stronger and will not corrode Easy to install, simply replace the OEM bleeder screw with the Micro Bleeder Reduces harshness caused by air build-up Allows bleeding of air pressure without tools One of the easiest bolt-on upgrades you can make to your forks Kit includes two bleeder valves