Custom fit Replacement Headgear for F400, F500 Series ORS NASCO Slip resistant handles Internal cam mechanism Slip resistant handles Internal cam mechanism provides greater torque Hardened steel jaw and blades for a clean cut Connecting and protecting electrical loads is crucial to reliable Deeply offset pliable headband fits head contours comfortably Overhead band with multiple adjustments helps position the glassholder for the best view of the weld and a comfortable working position Exclusive “free floating” arms balance and stabilize the helmet while minimizing pressure points Strip proof ratchet head size adjustment provides small increment sizing