CDU of 30 MarXman Standard Professional Marking Tools. Due to the MarXman Standard Professional Marking Tool having a unique design, with one push - it quickly, easily and clearly marks almost any surface. Suitable for jobs requiring fixing holes up to depths of 45mm. 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.The perfect drilling companion for electrical, plumbing, building jobs as well as many more.