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Description3M™ Cap Mount Hard Hat Headgear H20 with 3M™ Headgear Adapter HA21 This corrosion-resistant nylon cap mount headgear works with most slotted hard hats and features a unique system that helps allow window replacement in seconds. Benefits Includes HA21 headgear adapter for use with most slotted hard hats. No snaps, bands or cams offers easy window replacement. System gives users a wide choice of faceshield materials, sizes, shapes, and tints for task specific requirements. Meets the requirements of ANSI Z87.1-2003.