Pack of five replacement inside cover lenses (part number 528025) to suit the 3M Speedglas Welding Lens 9100XX, 9100XXi and the Speedglas G5-01 auto-darkening filter. Inside cover lenses protect the inside of the 9100XX, 9100XXi or G5-01 welding lens from scratches, sweat, wear & tear. Inside protection plates are essential for the care & maintenance of your Speedglas™ welding helmet 9100XX, 9100XXi or G5-01. Recommended replacement time is once a month depending on use. Inner cover lens dimensions 117 x 77mm.