3M™ Speedglas™ Inner Protection Plates are replaceable spare parts for 3M™ Speedglas™ Welding Helmets and are designed to protect the welding lens.3M™ Speedglas™ Inner Protection Plates are replaceable spare parts for 3M™ Speedglas™ Welding Helmets to protect the welding lens from spark and welding spatter. Replace when your existing 3M™ Speedglas™ Inne