Miller® 2" X 4" Auto-Darkening Welding Lens having fixed shade of 10 is designed to fit fixed front and lift front helmets. Lens offers 3.7" X 1.37" viewing field and has a switching speed of 1/3600 sec. Lens with 2 arc sensors for quick response is solar powered. Lens includes auto-on/auto-off circuitry and is backed by 2 yrs warranty. It meets ANSI 87 and CSA Z94.3 standards.