Threaded adapters available from 1.5” to 6”. All adapters provide the necessary safety features for municipal fire fighting. Storz adapters 4” and larger feature a Storz-Lok locking mechanism. All threaded adapters are hard coated to military spec. Type 3 and made from aircraft #6061-T light weight aluminum. All female swivels utilize stainless steel ball bearing or aluminum roller bearings, no plastic.