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 Suitable for most surfaces including tiles, breeze-blocks, granite, plaster and cement. The chalk is fluorescent and can easily be seen from a distance, particularly useful if fixing at height MarXman Deep Hole is suitable for depths 45mm -100mm Drill precisely every time – The MarXman marks holes that pencils and punches just cannot reach to leave a clear mark for perfect positioning of your drill Highly visible – The unique formula is easy to see in all lights, and remains visible for long periods even in a busy site environment, Weight: 0.0881849048 Pounds, Manufacturer: Marxman Ltd