Prettier than the stock Brompton plastic equivalents, in aluminum. 6mm is for the frame mount sort; 5mm for the back of a rear carrier.
Two wheels per pack.
Replaces Brompton part QEZWSET-NR
If your bicycle was purchased with a Brompton rear carrier during or after 2016, the rear carrier may have 6mm drilling. In this case, the Brompfication EZ wheels will not work.