Threaded Blind Caps - NH Female Long Handle w/ ChainThreaded adapters available from 1 to 6. All adapters provide the necessary safety features for municipal firefighting. Storz adapters 4 and larger feature a locking mechanism. All threaded adapters are hard coated to military spec. Type 3 and made from aircraft #6061 T lightweight aluminum. All female swivels utilize stainless steel ball bearing or aluminum roller bearings, no plastic. Available Models: HTBC 25NH 2. 5 NH Female Long Handle Cap w