SYP 501 Solid Wall Super Grips" Fixings Yellow (100)|The Plasplugs Super Grips wall plugs are suitable for concrete and brick fixings|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).