Pack of ten replacement high-heat outside cover lenses (part number 527070) to suit the 3M Speedglas Welding Helmet Series 9100 and the Speedglas G5-01 Welding Helmets. High heat resistant outside cover lenses for high amperage, high heat applications Protection plate is rated to 205 degrees compared to 140 degrees for the standard Speedglas outside plates. It is suggested to replace high heat cover plates once a fortnight depending on use. Scratch-resistant cover plates also available (part number 527000). Lens dimensions 155 x 96mm.