These aluminium parts cover the big holes above the foot pegs of your BMW and make sure that no dirt or dust can stay in it, water can still escape. The covers will be installed with an expansion holder. You use an Allen wrench to fasten the screw which expands an O-ring which will keep the covers perfect in place. The unmounting is of course also easy and fast.
Shipment contains a set (2 pieces for left and right side).