These push fasteners are used to clip the hood scoop ducting on to the hood on 2008+ WRX and STI models. Sold as a set of five. On the 2008-2014 cars, there are about twenty fasteners total that secure the entire duct, so if you don't have ANY of these, order at least four kits. The 2015+ cars don't use quite so many.
Set of five fasteners.