Federal bbs guard sprocketthe federal bbs guard sprocket is machined from high quality 6061 t6 aluminium and provides the ultimate in durability and strength it features a guard design which protects the teeth and your chain from impacts its 24mm central bore means it fits straight on to federal cranks and all other bmx cranks that use this spindle size features material6061 t6 aluminium tooth size 18 24mm bolt drive centre bore 24mm weight 178g 25tbuyfederal componentsfrom chain