This will allow you to mount a shimano I-Spec A or I-Spec B shifter directly to your handlebars. These are great if you don't have the matching brakes these were designed for. Selling these in any color. Please be sure to also get the cap for this, http://shpws.me/PlFa
You will also need some M3 nuts and bolts to attach everything. These can be sourced at any hardware store.