I recently needed a 6mm and 10mm spanner but even pricing them up in a cheap shop it seemed a lot for how many times I'd use them. However I spotted this in the cycle section €2 (£1 70p) for 10 in 1 multi tool (6mm -15mm), not the best quality but does the job for me. And if you buy a bike £989.99) you've got all the extras.
