The Wolf Tooth Front Derailleur Mount was designed to help those with an aesthetic eye make their 1x setups look sleeker in the absence of a front derailleur to cover its mounting holes. If you value additional flair on your ride this is a nifty little upgrade. After switching to 1x Drop-Stop chainrings, an empty spot is left on many bikes where a front derailleur used to be. This product is an attempt to remedy the situation. These covers fit on to the direct mount front derailleur position on bikes with that type of mount. Compatible with any direct high mount front derailleur mount.  Wolf Tooth Front Derailleur Mount Specifications Weight:  7g (cover+bolt) Material:  7075-T6 aluminum Included: light-weight aluminum bolt Manufactured: Minneapolis, MN USA