Fibre Lyte's carbon chain deflector is a simple and elegant solution for a chain guard. The simple design etched from carbon and finished with a 3k weave prevents the chain from falling into your frame. Although a well adjusted front derailleur should prevent this from happening rough riding such as CycloCross or cobbles can still cause issue. The simple design lacks the adjustability of a sliding pinch bolt such as Far and Near's and KCNC's it works well with a bit of attention on install and matches perfectly with carbon cranks and chainrings.
Please note that these do not come with a bolt. If your concave washer is part of your mounting bolt you will need to get a new bolt and washer.