Before you drill
What size drill bit for a wall plug?
Choose the plug colour or diameter and get a quick matching masonry-bit guide.
Match a drill bitThe usual UK rule
For many common plastic plugs, the hole diameter matches the plug diameter. A red 6mm plug usually takes a 6mm masonry bit. Always check the package: brands and wall materials can differ.
Do not use this for load-bearing or safety-critical work, and check for hidden pipes and cables before drilling.