They are used for fitting wheel arch linings, and engine under-trays onto various makes and models of vehicle.
10x Plastic Nuts Unthreaded Engine Wheel Arch Cover Undertray Splashguards clips
Genuine GM 10x Exhaust Manifold Nuts Vauxhall Astra H Mk5 2004 to 2010 11082413
For MINI R56 Arch Clips Wheel One S Cooper Exterior trim 10x Plastic R55 R57
10x Plastic Front Bumper & Grille Clips for the Nissan Qashqai