It may not happen today. Maybe not next week But chances are, sooner or later, you're going to experience overshift. Why risk damaging your valuable road bike when overshift does strike, when this simple and affordable little gizmo can ensure that a meandering chain never chews up your frame or messes up your momentum? Features: Prevents missed front shifts and frame damage from a dropped chain For use with braze-on front derailleurs only Includes textured non-slip radius washer and two length fixing bolts for compatibility with Campagnolo, Shimano, and SRAM front derailleurs Precision machined, anodized 6061 T6 aluminum Specifications: Type: For Braze-On Derailleurs Color: Black Weight: 15g