Hi Richard,
The ones I use have a larger flange to give a better contact with the bottle cage etc: 7mm drill hole, 10.5mm flange:
These are zinc plated steel. I find that while the aluminium ones are easier to pull as they are softer material, the knurled teeth on the aluminium ones don't grip the hole very well at all.
A QR might do the job, but you might need proper tools this big:
PM your address and we can get you some shipped.
All the best,