Which tap??

[Chas]

A set like that would might be OK to start you off, but you're going to need to replace the ones you use/break most often.

I bought a comprehensive boxed set from M3 to M14 & replace when needed from MSC Industrial Supply Co..

[r0bsk1]

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.