These ROK air compressor reducers make a great addition to your pneumatic tools set. The reducer fittings are made of brass for durable, lasting performance. They feature a 1/4-inch NPT threaded female side and a 3/8-inch NPT threaded female side to allow you to connect your tools and hoses. The hexagonal shape makes the adapter fittings easy to tighten and install. Packaging contains 2 reducers.