This front derailleur is firm and durable， suitable for 34.9mm tube. With a additional washer used with 31.8mm tube.

Features:
Transmission system， speed change front derailleur.
Made of aluminum alloy， firm and durable.
34.9mm in diameter of the clamp ring. 
Additional washer used with 31.8mm tube.
24-Speed compatible.

Specifications:
Material: Aluminum alloy
Max teeth capacity: 48T
Diameter of clamp ring: 34.9mm / 1.37in
Weight: 148g / 5.24oz

Package List:
1 * Front Derailleur 
1 * Washer