CDU of 30 MarXman Deep Hole Professional Marking Tools. The MarXman Deep Hole Professional Marking Tool has a unique design. With one push, it quickly, easily and clearly marks almost any surface. Each pen contains 250+ bursts of removable, fluorescent green pigment and is capable of marking all surfaces including brick, metal, wood, pebbledash, porcelain and ceramic. Recommended for jobs with fixing holes exceeding depths of 45mm, e.g. fence posts. Its special nozzle is designed to shoot the green pigment further and more accurately. Not advised for marking distances under 45mm. The perfect drilling companion for electrical, plumbing, building jobs and much more.