these ones are terrible. buy some better ones and save your time.

Not a bad price, but I would suggest better to buy separate boxes of 100 each from Toolstation (£1.49 for 300) as a basic set. I tend to use loads of the red ones (5.5 drill bit) and a few of the brown but very very little of the yellow ones. So you might end up with a load of plugs you don't need.

Great price, so heat given.

Personally, I would prefer to use the Rawplug ones, they cost £3.50 more (and there are less of them), but they will last the average diy-er years

Rawplug selection for £6.99

While they are cheap so long as you use the smallest suggested drill bit they are fine, just tap them in with the screw.