Confined space dangers include entrapment, fumes and proximity injury in areas such as bins, tanks, vaults and silos and may require permitting and/or mitigating procedures and equipment. Avoid unsafe and potentially deadly situations with NMC's wide selection of confined space Signs. Stay in compliance with these high-quality, durable Signs protected by NMC's Sign Muscle™ for free. Manufactured from rigid, 3mm plastic. Made in the USA.