Pack of ten replacement hard-coated outside cover lenses (part number 527000) to suit the 3M™ Speedglas™ Welding Helmet Series 9100 and Speedglas™ G5-01 welding helmets. Hard-coated Speedglas outside protection plates have a heavy-duty coating which helps to prevent scratches, wear and tear. Scratch-resistant cover lenses last approximately twice as long as the standard outside cover lenses. It is suggested to replace hard coated cover lenses once a fortnight depending on use. High-heat cover lenses also available (part number 527070). Lens size 155 x 96mm.