Are these grey 8mm wall plugs suitable for masonry?

[stats101]

Have quite a heavy mirror to put up, and unsure whether to use the standard 7mm brown plugs, or these 8mm grey ones:

Is the above suitable for masonry, or are they usually for plasterboard? If the plug is 8mm do I use a 8mm drill bit? What size screw would be suitable?

Thanks!

 

[Jackrae]

Those are masonry plugs and are not suitable for plasterboard. They are far better than the brown ones you have. 8mm drill required.

 

[foxhole]

Yes you can use either, easily strong enough for your mirror. If walls are sound 8mm bit, if loose then start with 7.5mm.