A simple precision-made component that provides valuable insurance against front derailleur malfunctions Pro model is easier to fit & allows for independent adjustment of the front mech & chain catcher Used to good effect by top professional riders in the Olympic games World Championships Tour de France Giro d Italia Paris Roubaix & many more It acts as a ramp to guide your chain & virtually eliminates the possibility of your chain dropping off the small chainring onto the bottom bracket helping to protect your frame & keep you in gear Highly recommended to prevent structural damage to carbon & aluminium frames but also protects the finish of any other frame material Complete with all mounting hardware & fits onto braze-on frame mounts Compatible with double chainring Shimano Campagnolo & SRAM derailleurs Made from 6061 T6 heat treated aluminium Long-lasting protective anodised finish Adds only 15 grams of weight K-Edge products are proudly CNC machined in the USA & have a Lifetime warranty: you break it well replace it