Pack of ten high-heat replacement outside cover lenses (part number 777070) to suit the 3M™ Speedglas™ Welding Helmet Series 100. High-heat resistant outside cover lenses for high amperage, high heat applications. Protection plate is suitable up to 205 degrees compared to 140 degrees for the standard 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 777000). Lens dimensions 145 x 86mm.