Extra long brackets for adapting rack installations.
The tubular brackets allow many 'side' mount type racks to be installed on Dutch on Euro upright touring bikes with flat mount, or an many other bikes that have no provisions for a rack thanks to the included clips. In some cases these can also be used to install a dutch style rack on a non-Dutch bike.
The flat bracket is almost double the length of what's included with common North American alloy racks. This can help level the rack, provide foot/pedal clearance for panniers, and generally facilitate installation on a range of bikes (extra small bikes, long/low rear triangles on cruiser bikes, etc.)