Keep a cool head while welding with Zoro's assortment of headbands, sweatbands and helmet cooling systems. Take a look at the features for 3M Speedglas Polycarbonate Protection Plate. For Use With: 4CWG9 and 4CWH1, Characteristics: -, Function: Designed to Protect the Outside Surface of the Auto-Darkening Filter from Spark and Spatter.