The EXELAIR® EX0320MKIT coupler and plug kit is an outstanding starter kit for outfitting your shop. It comes with 20 pieces, all M-style®, all ¼” NPT thread. Included in the kit are 15 plugs – 10 of which are male thread, 5 are made of brass. Also included are 5 plugs with female threads. You get 5 couplers, one of those couplers is made of brass. Also included is a convenient plastic storage kit and as always, it is backed by Milton Industries, Inc®.