Lightweight, aerodynamic wheel anchors, £75
Zipp's new Aero version makes a good fist of it - light at 53g but not to its detriment. A simple cam knuckle with a good length of aluminium lever pivots well enough on the brass bushing.
You have the choice of a steel or titanium axle with the normally round nut given the aero treatment in a Zipp style. The prices are a little steep but then that's not a surprise for a US company.
If you want that finishing touch then Zipp's Aero QRs are a well-crafted component, which works well and looks classy with any bike and wheel combination.