BLUE LUG downtube shift boss cover (brass)These will cover your downtube shifter bosses when you are not using them. We made it into a shape that will match perfectly with the outer stoppers from Shimano and DIA COMPE. When you build a Surly straggler or Cross x Check as a front single bike, you are able to make it look slick. You could of course use them for single speed modified bikes Sold individually. bolt included.