Chainstay protectors, plate and bolt. The Chainstay Sandwich. This is a nice thing to use in case your frame doesn't have a dedicated kickstand plate brazed-on the bottom of the chainstays. And if you're not riding a Huffie, Mangia or a recent Riv then you got no kickstand plate. Or you can use a few wraps of scrap cloth bar tape 'round the chainstays instead of this if you want to save a few bucks.
Short bolt for kickstand plate users. Lucky you, your frame has a kickstand plate! Instead of hacksawing the regular kickstand bolt down to size get this stumpy 8mm allen for easy kickstand installation.