Description:   Sandblasting Helmet High strength ABS material, Durable, non-toxic, and odorless. Air intake equipped with a silencer to prevent airflow into the helmet noise. Equipped with air grooves air evenly around. Air flows into the frame, eliminates breathing air, vision becomes clearer. Equipped with damping adjustment on the top screen, adjustable size, head feels more comfortable. Silica gel trachea, soft and pliable. Wide view of the frame, you can easily replace window glasses. The neck is equipped with a flexible interface, good sealing performance. Suitable for: large cutting, crushing, grinding, sand blasting, coating, chemical, cleaning, and other harsh work environments.   Specification:   Color: Red(helmet ) Lens Material: PVC material Helmet Material: ABS material Pipe Material: Silica gel Pipe length: 72cm/28.3'' The diameter of the Pipe: 35mm, Diameter of the Pipe Orifice: 16mm Internal screw thread: 25mm Helmet: 24.5cm x 27cm x 29cm/9.6'' x 10.6'' x 11.4'' Cloak: 80cm x 100cm/31.5'' x 39.4'' Len: 40cm x 14cm/15.7'' x 5.5'' There may be some error according to manual measurement, please forgive it, thank you.   Feature:   The adjustable telescopic suspension, suitable for different sizes of the head. By broadening the length of the ventilation radian of the helmet to slow down the inlet speed. It could reduce the shortcomings of difficulty in breathing and eye dryness. The Helmet diaphragm adopted a double PVC scratch-resistant ultra-thin lens. That could reduce the change of the lens, reduce the cost, and enhances the service life of the lens.   The Helmet uses two front view frames. It's easy to remove the replacement and also increase the wide field of view. Packing List: 1.Helmet *