Features: Versatile Application: Compatible with both Mountain (MTBs) and Road bike Frames. Front Derailleur Specific: Designed to adapt clamp-on front derailleurs to various seats tube sizes. Seats Tube Diameter Conversion: Essential for bridging the-gap between different frame seats tube diameters and derailleur clamp sizes. Enhanced Compatibility: Greatly expands the ranges of front derailleurs that can be mounted on your frame. Secure & Stable Mounting: Ensures a firm, slip-free grip for consistent and reliable shifting performance. Notice: 1.Actual color may be slightly different from the image due to different light effect 2.Please allow 1-3cm deviation due to manual measurement Description: material: aluminum Alloy Package List: 2x Bike Front Derailleur Shim