Plasplugs PLASAP505 SAP 505 Solid Wall Super Grips Fixings Assorted (150) 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).