This spring chain idler comes with everything pictured (besides the bike). The cost for this upgrade will save you time and money. Don’t run around on a loose chain, make sure your chain stays snug.
Spring Chain Idler
This chain tensioner is the perfect upgrade for little cost. Especially if you are having issues keeping your chain snug. Simply bolt in and let the idler do all the work. This set includes all the pieces pictured (except the bike, which is used for example).