High quality infinitely variable shade 9-13 lens manufactured and tested to BS EN 379. Fully automatic switching from light to dark on striking arc. Features infinitely adjustable sensitivity and delay switches. Grinding function enables user to grind without removing mask. Deluxe contoured helmet approved to BS EN 175 which gives full neck protection and protects lens from scratching when helmet is laid down. Comfortable headband and non-slip quick release ratchet mechanism. Suitable for MIG, TIG, arc and gas welding.