Sealey pwh620 welding helmet auto darkening shade 5 8 9 13 sealey pwh620 p this welding helmet from sealey has high quality infinitely variable shade 9 13 lens with added ability for shades 5 8 by the switch enclosed on the control unit 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 p p the deluxe contoured helmet has also been approved to bs en 17