SHK-1 Standard Brim Non-VentedSTUDSON SHK 1 Non Vented Safety Helmet The SHK 1 Non Vented is built for environments where a sealed shell isn't optional. Class E rated to 20,000 volts, it carries the same Koroyd impact core, Twiceme NFC, and Fidlock chin strap system as the vented model without the openings that disqualify vented helmets from electrical applications. Built for electricians, utility workers, and anyone working in or around high voltage environments. Key Features