This handy tool from MarXman marks drilling positions through fixing holes up to 45mm deep and from 3-13mm in diameter. Pushing the marker into fixing holes delivers a burst of bright chalk through the hole onto the mounting surface, clearly showing where the hole needs to be drilled.
This innovative marker works on most surfaces, from tiles and breezeblocks to granite, plaster and cement. You can then drill your holes with the confidence of precision. The MarXman marker is fluorescent so it can be seen in low light, and it will easily rub off after use.