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)

This assorted pack contains the following:

50 x Regular-duty yellow Super Grips™: Accepts screws No 4-8 (3-4.5mm).
50 x Regular-duty red Super Grips™: Accepts screws No 6-12 (3.5-5.5mm).
50 x Heavy-duty brown Super Grips™: Accepts screws No 8-14 (4.5-7mm).