Jackson Safety* Hard Hat Interchange System Replacement Blades To be used in combination with Hard Hat Interchange System Face Shield System and/or Welding Helmet System. Remain Compliant – Quickly switch between face shield and welding helmet without removing hard hat Audible Click – Know your PPE is assembled correctly Flexible – Use with SC-6 hard hat bill forward or backward Quick Release – One Button Action Vertical Lock – Eliminates helmet/face shield creep