Woodcraft Toe Guard Kit (Narrow Coverage) (Black Aluminum) Inexpensive insurance against a potentially serious injury. In the case of a crash that places your leg near the rear sprocket, the shark guard will help deflect your foot out of harm's way. Other toe guards ask you to drill and tap into your stock swingarm. The average swingarm today is 4 - 6 mm thick aluminum, which can leave you with mounting bolts that can easily strip out. Woodcraft supplies two rivet nut inserts, a hex wrench and a friction wrench installation tool with every kit.