Aluminum cap cotton

Aluminum cap cotton 

38mm long

"Bicycle cap bloomer" (also known as "blooming plum blossom with cap") is a part used to install on the inside of a bicycle fork (brake),

 especially carbon forks. Its structure includes a plum blossom (flower) and a screw cap, which has the function of compressing to keep the steering column system and the handlebar (stem) firmly fixed.