These boots are designed to fit bat-handle toggle switches, push-button switches, and panel-seal circuit breakers. They bond to a mounting nut to prevent delamination and offer excellent environmental protection.
Base Thread Size 1/2-32 NS-2B (internal thread for mounting on toggle switches or waterproof circuit breakers. The material is Flexible, tear-resistant black silicone rubber (provides watertight seal, vibration resistance, and wide temperature tolerance)
Storage/Shelf Life: Silicone lasts years but keep away from extreme heat/oils.