Plasplugs Solid Wall Super Grips are suitable for fixing into concrete and brick. They are available in 3 different sizes/colours.

Yellow: Regular-duty, accepts screws No.4-8 (3-4.5mm)
Red: Regular-duty, accepts screws No.6-12 (3.5-5.5mm)
Brown: Heavy-duty, accepts screws No.8-14 (4.5-7mm)

The brown wall plugs are heavy-duty and will accept screws No 8-14 (4.5-7mm).
Drill: 7mm.
Pack quantity: 300.