Replacement head suspension assemblies, headbands and spare parts for 3M™ Speedglas™ Welding Helmets.Replacement suspension assemblies, headbands and spare parts for 3M™ Speedglas™ Welding Helmets. Headband assemblies are highly adjustable and comfortable with a smooth ratchet for precise tightening. For maximum safety and comfort, regularly check your equipment for worn or damaged parts.