I've been using these taps.....
HSS Tap Set M8 x 1.25 8mm | eBay

....and these drills
1 x 8.0MM COBALT DRILL BITS 8MM DRILLS TOP QUALITY | eBay

...today. Got about 50 holes of M6 and M8 drilled and tapped in ali and steel and the tools are just beginning to dull.