High Purity 44; Designed with a valve action mechanism that allows the marker tip to be re-inked, even when the cap is left off. Marker barrel is threaded so it can be secured in a jig or apparatus for continuous marking applications. Unique cap design features a clip that prevents the marker from rolling and can easily be secured to a clip board or in your pocket. Ideal for welding, aircraft industries, marine industries, power plants, automotive plants, and oil and natural gas refineries. Paint will not contaminate or adversely affect surface being marked.