Marks a fixing point through fittings or fixtures at depths up to 50mm. A unique patented tool designed so that with one push it quickly, easily and clearly marks almost any surface. Simply push the Marxman pen into the fixture hole and a burst of bright green chalk will mark the surface with the required drill hole point.Bright green visible marker.Approx. 250 bursts.Fixture marking depth – up to 50mm.Easy to remove.UK designed & manufactured.As seen on TV from BBC’s Dragon’s Den.