Features: *The pressure plug is made of aluminum alloy and stainless steel. *Designed for carbon fiber front forks and mountain bike suspension forks with an outer diameter of 25.4-28.6mm. *Adjust the diameter from 22.2mm to 25.4mm by tightening the compression bolts to fit the steering tube. *When using carbon fiber forks, compress the headphones together securely and firmly. *Before installation, disassemble the components and grease every part except the sleeve. *For 1-1/8" (28.6mm) stem