Plastic wall plugs (often called Rawlplugs) are the most common fasteners used for securing light to medium-weight items into solid brick, concrete, stone, or plasterboard.
They work by expanding inside a pre-drilled hole as a screw is driven into them, tightly wedging themselves against the surrounding material.
Standard Colour & Size Guide
In the UK and Europe, plastic plugs are usually color-coded by size. Matching the correct drill bit, plug, and screw size is critical to prevent the plug from spinning or pulling out.
Plug Colour
Drill Bit Diameter
Typical Screw Size
Best Used For
Yellow
5.0 mm
3.0 – 4.0 m (No. 4 – 6)
Lightweight items (small pictures, smoke alarms)
Red
6.0 mm
3.5 – 5.0 mm (No. 6 – 10)
Medium loads (shelves, curtain rails, TV brackets)
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